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Louisiana Purchase (1803)

Image: Nik Shuliahin

It sounds crazy today, but the Louisiana Purchase almost doubled the size of the United States overnight. Thomas Jefferson, at the time, the third to occupy the position of President of the United States, bought the massive 828,000 sq mi territory from France for $15 million, securing vital land and resources.

The purchase, however, didn’t mean that the United States also gained control of the totality of the territory, as it was inhabited by Native Americans. But in any case, the acquisition paved the way for westward expansion, providing a vast area for exploration and settlement, while enhancing America's geopolitical influence.

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Lewis and Clark Expedition (1804-1806)

Image: Charles Marion Russell

Commissioned by Jefferson, Meriwether Lewis and William Clark then embarked on a mission to map the newly acquired lands and find a viable route to the Pacific. Their legendary journey revealed the rich diversity of the western territories and established crucial relationships with Native American tribes.

Sacagawea, a Shoshone woman, played a crucial role as an interpreter and guide, helping the expedition navigate difficult terrain and gain trust with native tribes, significantly contributing to the mission's success. Ultimately, their detailed reports opened the frontier to future explorers and settlers.

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The Oregon Trail (1811-1869)

Image: Dana Davis

Originally laid around 1811 by fur trappers and traders, the Oregon Trail soon became a critical route for thousands of emigrants moving west. Spanning over 2,000 miles from Missouri to Oregon, it was a perilous journey marked by harsh landscapes and, more often than not, disease.

Despite the hardships, the trail was improved to become passable by wagons, and it facilitated the mass migration of over 400,000 settlers during its peak, significantly contributing to the population growth and development of the Western United States.

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California Gold Rush (1848-1855)

Image: Viviana Rishe

The discovery of gold at Sutter's Mill in 1848 triggered a massive influx of fortune seekers to California. The Gold Rush not only boosted the economy but also accelerated California's admission claim as the 31st state in 1850.

While prospectors initially used simple techniques like panning, the increasing complexity of gold extraction eventually required significant financing, favoring mining companies. And though the gold rush generated wealth worth tens of billions in today's dollars, only a few became rich; most participants earned little more than they had started with.

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Homestead Act (1862)

Image: Kevin Butz

Signed by President Abraham Lincoln, the Homestead Act offered 160 acres of public land to settlers willing to farm it for five years. The policy primarily encouraged individual farmers who were looking to operate their own farms, as opposed to slave owners who sought to buy large tracts of land and use slave labor.

The legislation encouraged widespread migration to the Great Plains, accelerating agricultural development and expanding American settlements across the West.

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Building of the Transcontinental Railroad (1863-1869)

Image: Johannes Plenio

The completion of the first Transcontinental Railroad in 1869 revolutionized transportation in the United States. Connecting the East and West coasts, it facilitated trade, travel, and communication.

The extensive railroad network was built by three private companies on public lands, financed with federal bonds and various subsidies. Instrumental in the nation's economic growth, the Transcontinental Railroad also helped forge a sense of national unity and identity in the American consciousness.

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The Great Sioux War (1876-1877)

Image: Popular Graphic Arts

Also known as the Black Hills War, the Great Sioux War was a series of conflicts between the United States and the Sioux tribes. The war was sparked by the encroachment of settlers and gold prospectors on Native lands, a conflict that had been escalating since the early 19th century.

Despite many Native American victories, such as the Battle of Little Bighorn - better known as Custer's Last Stand -, the war ultimately ended in the tribes' displacement. The conflict officially finished with the Agreement of 1877, in which the Sioux tribes were forced to cede property rights of their lands to the federal government, while clearly demarcated Indian reservations were established.

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Oklahoma Land Rush (1889)

Image: Raychel Sanner

On April 22, 1889 - soon after the signing into law of the Indian Appropriations Act, which freed over two million acres of land for settlement - thousands of settlers raced to claim land in the Oklahoma Territory during the first of several land rushes.

Those who followed the rules and waited for the official start of the land rush were known as "boomers," while "sooners" sneaked into the territory before the designated time, risking penalties but gaining advantageous claims. This sparked hundreds of legal contests that had to be settled at local land offices or even by the U.S. Department of the Interior.

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The Dawes Act (1887)

Image: Boston Public Library

The Dawes Act aimed to assimilate Native Americans by dividing tribal lands into individual allotments. While intended to promote agriculture and integration, it resulted in the loss of tribal lands and culture.

The act was a controversial effort to reshape Native American society in the image of European-American settlers. It wasn’t until the Indian Reorganization Act, passed during the Franklin D. Roosevelt administration, that Native Americans regained some of their rights to own land collectively and form self-government.

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Closing of the Frontier (1890)

Image: Aaron Burden

In 1890, the U.S. Census Bureau declared the frontier closed, as there was no longer a discernible frontier line. This marked the end of a significant era of American expansion.

The closing of the frontier signified the nation's transition from a period of exploration and settlement to one of modernization and industrialization.

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#15 - Lake Michigan (Illinois, Indiana, Michigan, Wisconsin)

Image: Adam Bouse

Lake Michigan is a stunning natural treasure. Towering sand dunes, pristine beaches, and urban centers line up along its shores. Visitors flock to breathtaking hiking trails, like the ones in Sleeping Bear Dunes National Lakeshore .

The lake's expanse touches several major cities, including Chicago, Milwaukee, and Traverse City, which explains the endless flow of tourists arriving each year.

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#14 - Flathead Lake (Montana)

Image: Josiah Gardner

Flathead Lake is a peaceful haven nestled between Glacier National Park and the Mission Mountains. Its vast, crystal-clear waters are ideal for boating, fishing, swimming, and kayaking.

Surrounding small towns like Polson and Bigfork welcome visitors with their charming shops, restaurants, and art galleries. Visitors can also join boat excursions to Wild Horse Island, where bighorn sheep and wild horses roam.

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#13 - Lake Champlain (New York, Vermont)

Image: Ronan Furuta

Lake Champlain is the choice for history fans. Its guided tours explore the region’s rich history , including Revolutionary War sites and stories of naval battles fought on the lake.

The lake spans the border between New York and Vermont, with nearby towns such as Burlington and Plattsburgh, which offer waterfront dining and quaint streets.

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#12 - Grand Lake (Colorado)

Image: Ellery Sterling

This is the largest natural lake in Colorado. Right by Rocky Mountain National Park, Grand Lake offers a serene escape into the state’s breathtaking wilderness.

The town of Grand Lake is also known for its historic boardwalk and artistic community . The area is particularly popular during winter when visitors can enjoy snowshoeing, ice fishing, and proximity to ski resorts.

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#11 - Lake Okeechobee (Florida)

Image: Heiner

Known as Florida’s "Inland Sea," Lake Okeechobee is the state’s largest freshwater lake.

Herons, egrets, and ospreys can be spotted here. The lake also offers some of the best bass fishing in the country, which has turned it into a world-famous spot for fishing enthusiasts.

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#10 - Lake George (New York)

Image: Bill Alexy

Sparkling waters surrounded by the Adirondacks, Lake George was dubbed the " Queen of American Lakes ." Visitors know it as a perfect spot for hiking, boating, and camping. The village of Lake George is a lively hub with restaurants, shops, and events like the annual Adirondack Balloon Festival.

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#9 - Crater Lake (Oregon)

Image: velichor

Famous for its deep blue color and clarity, Crater Lake is the centerpiece of Crater Lake National Park. The lake formed within a collapsed volcano and is the deepest in the United States. Visitors can take guided boat tours to Wizard Island or explore hiking trails around the caldera.

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#8 - Lake Powell (Arizona, Utah)

Image: Carmel Rossen

Lake Powell is a man-made reservoir straddling the Arizona-Utah border. It attracts approximately two million visitors yearly. A unique sight, this beloved destination is lined with striking geological formations like Rainbow Bridge, one of the world’s largest natural arches.

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#7 - Lake Superior (Michigan, Minnesota, Wisconsin)

Image: Hans Isaacson

Of course, it’s on the list: Lake Superior is the largest of the Great Lakes and the world’s largest freshwater lake by surface area . Its vast expanse is lined with forests, rocky cliffs, and sandy beaches.

Visitors explore spots like Apostle Islands National Lakeshore, with its sea caves and historic lighthouses, or the charming town of Duluth, Minnesota, known for its shipping heritage and beautiful harbor.

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#6 - Lake Havasu (Arizona, California)

Image: Jack Nueva

Lake Havasu straddles the Arizona-California border and offers an array of activities, from jet skiing and paddleboarding to relaxing on its sandy beaches. The nearby Lake Havasu City hosts famous events, including a hot air balloon festival and classic car shows.

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#5 - Lake Tahoe (California, Nevada)

Image: Artur Westergren

In summer, visitors flock to Lake Tahoe's beaches for swimming, kayaking, and paddleboarding, while winter transforms the area into a skiing and snowboarding paradise . Nestled in the Sierra Nevada mountains, Lake Tahoe is renowned for its crystal-clear waters and vibrant nightlife.

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#4 - Lake Mead (Nevada, Arizona)

Image: Brett Funk

Lake Mead is a reservoir formed by the Hoover Dam on the Colorado River. It’s not just the largest reservoir in the country by volume , but also a popular recreational hotspot.

Its sprawling waters and rugged desert surroundings attract boaters, anglers, and hikers, and its proximity to Las Vegas has certainly helped attract tourists.

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#3 - Lake Erie (Michigan, Ohio, Pennsylvania, New York)

Image: Nicholas Mullins

As one of the Great Lakes, Lake Erie combines stunning coastal scenery with wineries and charming towns like Put-in-Bay, where visitors can tour historical sites and enjoy waterfront dining. The lake is also known for its diverse fish population, which has turned it into a top destination for anglers .

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#2 - Lake Washington (Washington)

Image: Henry Fraczek

Lake Washington, near Seattle, is surrounded by affluent neighborhoods and parks. The lake is also home to floating homes , famously featured in the movie Sleepless in Seattle .

Visitors can explore nearby attractions like the University of Washington Arboretum and take guided boat tours offering views of Mount Rainier and the Seattle skyline.

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#1 - Lake of the Ozarks (Missouri)

Image: Davis Patton

Known for its distinctive serpentine shape, Lake of the Ozarks features over 1,100 miles of shoreline. Osage Beach serves as the main hub for dining, shopping, and nightlife.

Another popular attraction is its nearby caves , some with unique phenomena like the Angel Showers, a constant shower of water dripping from the solid rock ceiling.

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Punxsutawney Phil

Image: Steve Wrzeszczynski

Every February 2nd, the eyes of the nation turn to a small town in western Pennsylvania. That’s where Punxsutawney Phil, a weather-predicting groundhog , is roused from his burrow on Gobbler’s Knob to look for his shadow.

According to tradition, if he sees it, we get six more weeks of winter; if not, spring is just around the corner. The quirky ritual began in 1887 and has since grown into a full-blown celebration.

2

Balto

Image: Meg von Haartman

In the winter of 1925, a deadly diphtheria outbreak threatened the remote town of Nome, Alaska. It was the sturdy Siberian Husky Balto who helped deliver the lifesaving antitoxin across snow and blizzard conditions to Nome.

Although dozens of dogs and mushers contributed to what became known as the Great Race of Mercy , Balto was hailed as a national hero. He even received his own statue in New York’s Central Park just a year later—a monument that still stands today, inscribed with the words: "Endurance, Fidelity, Intelligence."

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Seaman (a.k.a. "Scannon")

Image: The New York Public Library

In 1803, explorer Meriwether Lewis purchased a Newfoundland dog for $20 and named him Seaman. The dog became a four-legged member of the famed Lewis and Clark Expedition .

He accompanied the Corps of Discovery as they crossed the North American continent, helping with hunting, standing guard, and even surviving a wound from a beaver attack.

The funny bit is that for a long time it was believed that William Clark’s journals referred to the dog as "Scannon," but it might have been a dizzy transcription of his handwriting.

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Smoky the War Dog

Image: Simona Jašauskytė

Found in a foxhole in New Guinea during World War II, Smoky was a Yorkshire Terrier weighing just four pounds—but her size turned out to be her superpower .

She was trained by her rescuer, Corporal William Wynne, and famously ran communication wires through a narrow pipe beneath an airstrip in Luzon, Philippines.

After the war, Smoky became one of the first recorded therapy dogs, visiting wounded soldiers and performing tricks to lift their spirits. Today, she is honored with memorials in both the U.S. and Australia.

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Sergeant Reckless

Image: Irina Nakonechnaya

During the Korean War, a small Mongolian mare purchased by U.S. Marines for $250 and nicknamed Reckless made multiple trips through enemy fire to deliver ammunition and evacuate wounded soldiers, sometimes entirely on her own.

For her bravery, she was promoted to Staff Sergeant , awarded two Purple Hearts, and allowed to eat scrambled eggs, Coca-Cola, and beer with the troops. Today, statues in Virginia and California honor her legacy.

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Cher Ami

Image: William Chen

In the chaos of World War I, a pigeon named Cher Ami saved nearly 200 men from the "Lost Battalion" by flying a crucial message across enemy lines —despite being shot, blinded in one eye, and wounded in her leg during the flight.

Her message arrived, artillery fire was redirected, and the soldiers were rescued. For her bravery, Cher Ami was awarded the French Croix de Guerre and was later taxidermied after her death. You can still visit her at the Smithsonian National Museum of American History.

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Old Bob

Image: Philippe Oursel

Abraham Lincoln’s beloved driving horse , Old Bob, was a familiar sight in Springfield, Illinois, often seen trotting through town pulling the future president’s buggy.

But his most memorable appearance came in 1865, when he walked riderless and draped in a mourning blanket during Lincoln’s funeral procession. The image of the grieving horse moved the nation and was widely reproduced in illustrations and prints.

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Pauline Wayne

Image: Susan van Bragt

Pauline Wayne, a Holstein cow, was the last cow to reside at the White House. Gifted to President William Howard Taft by a Wisconsin senator, Pauline grazed on the White House lawn and provided fresh milk for the First Family.

She even survived a brief brush with danger when she was mistakenly sent to a slaughterhouse during a train trip—but was rescued just in time.

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Macaroni

Image: Sergej Karpow

When Lyndon B. Johnson gifted a pony to young Caroline Kennedy in the early 1960s, he probably didn’t expect Macaroni to become a national sensation—but that’s exactly what happened.

The little white Shetland pony often grazed on the White House lawn, delighting photographers and stealing the spotlight during Camelot-era press coverage. Macaroni received fan mail, appeared in Life magazine, and even inspired a song by folk legend Pete Seeger.

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Old Abe

Image: Arnaud Padallé

Old Abe was a bald eagle who became the mascot of the 8th Wisconsin Volunteer Infantry Regiment during the Civil War. Perched on a shield-topped staff, he accompanied troops into battle, reportedly screaming whenever gunfire broke out.

He survived multiple campaigns and quickly gained legendary status, later appearing on military insignia and even on U.S. war bond posters in both World Wars.

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Fala

Image: D_Theodora

Franklin D. Roosevelt’s Scottish Terrier, Fala, traveled with him on countless trips, had a press secretary, and even appeared in cartoons and newsreels.

One of the most famous White House pets in history , Fala was awarded a unique honor: he is the only presidential pet with a statue near his owner’s memorial in Washington, D.C.

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Checkers

Image: SlimMars 13

In 1952, then–vice presidential candidate Richard Nixon gave a nationally broadcast speech defending himself against accusations of financial impropriety. His emotional turning point was declaring that he would keep one gift no matter what: a black-and-white cocker spaniel named Checkers, beloved by his daughters.

Some believe the heartfelt mention of the pet was inspired by the earlier success of Fala. The speech struck such a chord that it is still known today as "the Checkers speech."