Jefferson sent Lewis and Clark to map, trade, and secure the West

Jefferson’s Lewis and Clark expedition joined the centuries-long hunt for Northwest Passage

For centuries, leaders pursued a direct seafaring trade route from Europe to Asia. Jefferson joined this quest by sending Lewis and Clark west, though they confirmed no such practical interior route existed across the continent.

Jefferson omitted a plan to go beyond the Louisiana Territory in his funding request

In January of 1803, the president sought $2,500 to fund the expedition (though it likely cost closer to $50,000). The ostensible rationale for the journey was to explore the newly purchased territory, but Jefferson did not mention he wanted Lewis and Clark to go beyond the newly acquired territory for several reasons.

Lewis and Clark’s journey became a blueprint for future exploration

Combining science, diplomacy, and logistics, the Corps of Discovery created a model for later expeditions—from charting the Arctic to NASA’s space missions.

Jefferson feared European control in the West of North America

Jefferson pushed for the Louisiana Purchase to prevent France or Spain from dominating the western frontier, securing control of the Mississippi River and vast lands that he felt were essential to America’s strategic and economic future.

Clark’s maps provided the first detailed record of the American West

Covering over 8,000 miles, William Clark’s maps charted rivers, mountains, and tribal territories with remarkable accuracy. Equipped with sextants, compasses, telescopes, and more, Clark became an expert at surveying—requiring extensive celestial and topographical observations each day.

The Lewis and Clark expedition lasted over two years

The Corps of Discovery departed St. Louis in May 1804 and returned in September 1806, covering more than 8,000 miles by boat, horseback, and on foot. See a timeline of the journey’s key events.

Lewis and Clark encountered more than 70 Native tribes during their journey

The Corps of Discovery’s diplomacy ranged from peaceful trade and vital aid from tribes like the Shoshone and Nez Perce to tense standoffs, most notably with the Teton Sioux, who nearly brought the expedition to a halt.

Meriwether Lewis grew up in the same neighborhood as Jefferson

Hailing from Jefferson’s Albemarle County neighborhood in Virginia, Lewis was a trusted aide and former Army officer. After leading the Corps of Discovery, he became Louisiana Territory governor in 1806, dying three years later under mysterious circumstances.

The expedition produced the first detailed climate records of the West

Lewis and Clark logged daily temperature, weather, and seasonal patterns throughout their journey, creating the earliest systematic meteorological record for the western territories of the United States. Their observations helped overturn longstanding views that weather west of the Appalachians was similar to the East Coast.

William Clark negotiated one-tenth of all ratified treaties between Native Americans and the US

After the expedition, Clark held key territorial and federal roles, overseeing western expansion and Native relations. While he expressed sympathy for displaced natives, he oversaw the transfer of millions of acres from Native nations to US control through various treaties.

The expedition documented 240 plant species, 178 new to western science

Lewis and Clark’s botanical records introduced species to Americans like bitterroot, ponderosa pine, and Oregon grape—plants unknown to western science at the time. See a selection of these species in this image gallery.

Thomas Jefferson dismissed the Erie Canal as 'little short of madness'

When first proposed, President Jefferson scoffed at the idea of carving a 363-mile waterway through wilderness and rock. With no precedent in American engineering, the canal seemed impossible.

Thomas Jefferson delivered his 1801 State of the Union address in writing

In 1801, President Jefferson ended in-person State of the Union addresses, feeling they were too monarchial, and sent written messages instead—a practice that lasted until 1913. His first message was written and sent via his secretary, Meriwether Lewis, who later led the Lewis and Clark expedition.

The Corps brought along an estimated 120 gallons of whiskey

To help them through the arduous trek, the Corps of Discovery brought the whiskey alongside wine, brandy, and rum for morale, trade, and medicinal use. Early on in the expedition, the adventurers reported frequent drunkenness.

John Marshall gained national prominence during the XYZ Affair

In 1797, President John Adams sent Marshall to France amid seizures of American ships. French intermediaries demanded loans and bribes before talks, and Marshall refused. Publication of the dispatches fueled the Quasi-War and elevated his reputation in the United States.

At age 22, Washington inadvertently started the French and Indian War

In 1754, while leading a small Virginia militia force in the Ohio Valley, Washington's troops ambushed a French scouting party. The clash heightened tensions between Britain and France and sparked a broader conflict that soon spread across North America, Europe, and parts of Africa and Asia.

Lewis brought his loyal Newfoundland dog on the expedition

Meriwether Lewis was accompanied by his dog, Seaman, a Newfoundland who traveled the entire journey—helping hunt, guarding camp, and even rescuing supplies from a river.

Learn about the extraordinary life of Sacagawea’s son, Jean Baptiste

Born during the Lewis and Clark Expedition, Jean Baptiste Charbonneau (nicknamed "Pomp") traveled to Europe at 18 with Duke Paul of Württemberg, spending six years in his court—gaining a classical education and fluency in multiple languages.

The Compromise of 1790 broke a deadlock over debt and the national capital

In 1790, Alexander Hamilton, James Madison, and Thomas Jefferson reached an agreement that allowed Congress to assume the states' war debts and to approve a permanent national capital on the Potomac River.

Americans touring the Louvre were inspired to create their own grand museums

The one-time royal residence was first transformed into a public museum in 1793 amid the French Revolution. Americans visiting in the early 1800s were both turned off by the aristocratic grandeur and compelled by the open access to the public. James Fenimore Cooper, the author of "The Last of the Mohicans," apparently came and measured the length of galleries.

'Grand Canyon of the Yellowstone,' a work by American painter Thomas Moran, inspired Congress to establish Yellowstone National Park.

The rivalry between Alexander Hamilton and Thomas Jefferson centered on federalism—the question of how much power the federal government should hold relative to the states.

The US used military pressure to force Japan to open to foreign trade in the 1850s

Commodore Matthew Perry arrived in Edo Bay (now Tokyo Bay) with heavily armed warships, pressuring Japan to open its ports. His expeditions led to the 1854 Treaty of Kanagawa, which opened two ports for supplies and established formal US-Japan relations. Full commercial trade followed later under the 1858 Harris Treaty.

The Gold Road: how the medieval empires of West Africa traded across the Sahara

Throughout the Middle Ages, the West African empires of Ghana, Mali, and Songhai moved valuables across the Sahara and as far north as France using the Gold Road. This route enabled the trade of gold, ceramics, manuscripts, ivory, religion, and...

Whitman's view on slavery was informed by a trip to New Orleans

In 1848, Walt Whitman traveled with his brother to New Orleans to pursue a job opportunity at the Daily Crescent newspaper. While there, he witnessed firsthand the horrors of the slave trade, an experience that would inform the political and artistic projects that followed.

Explore the specific authorities granted to Congress: the 'enumerated powers'

The Constitution grants Congress a list of powers—including taxing, regulating interstate commerce, and declaring war—while powers not explicitly listed are reserved to the states or the people, defining the federal government's scope of authority.

The Mississippian culture mastered corn cultivation, long-distance trade, and complex governance

From roughly 1100 to 1540, Mississippian peoples across what is now the Southeastern United States mastered corn cultivation, built political structures that organized large populations, and maintained trade networks that spanned much of the continent.

Explore an interactive map of battles from the American Revolution, along with detailed summaries of each engagement

During the French Revolution, a botanist's letter asking about "dear Rhus" (poison ivy) was intercepted, leading authorities to suspect he was conspiring with the Russians.

Stanford built a Google Maps for the Roman Empire, revealing how much it cost to travel in the ancient world

Track the location of the Voyager probes, currently between 13 and 15 billion miles away from Earth.

Hear about the 250-year history of the United States Postal Service, complete with some of its strangest deliveries, important innovations, and the figures that made it an American institution.

When a Paris department store hesitated to sell Estée Lauder's perfume, she 'accidentally' broke a bottle, causing the smell to spread throughout the store and shoppers to start asking to buy the scent.

Jimmy Carter signed a 1978 bill that legalized home brewing, a move credited with kick-starting the craft beer industry.

While El Niño moves warm Pacific Ocean waters east along the equator, La Niña moves them west, shifting where rainfall will become more common for months.

Search a massive database of over 4 decades of clues from the TV quiz show 'Jeopardy!'

Many legends about George Washington, including his supposed wooden teeth and the story of cutting down the cherry tree, lack evidence.

In 2018, 26-year-old missionary John Allen Chau was killed by tribesmen after attempting to reach and evangelize on India's isolated North Sentinel Island

Explore the animals that populate the depths of the ocean, from fish and coral in the first few hundred feet, all the way down to the bottom of the Mariana Trench.

Legendary architect Frank Lloyd Wright designed the SC Johnson headquarters in Wisconsin, aiming to make a cathedral-like workplace

Louisiana's 'Cancer Alley' is infamous for having some of the highest industrial pollution, toxic air emissions, and cancer risks in the US.

The American Society of Civil Engineers' infrastructure report card gave the US a C in 2025, its highest grade since the project launched in 1998.

Quincy Jones' 'Big Band Bossa Nova' helped introduce bossa nova—a jazz-influenced Brazilian genre—to the US

Before humans, the Soviet Union and the United States sent animals—including apes, dogs, and cats—to space during the Space Race.

Volcanic activity may have triggered the Black Death by spewing gases that led to crop failures in Europe, thus forcing the import of grain ships with plague-infested fleas.

Cultural norms about how to handle the bodies of loved ones in communities in West Africa have hampered Ebola responses.

Learn how to read a prospectus, the juicy document that any company must file with the SEC before going public.

Against his wishes, Albert Einstein's brain was removed before his cremation, and the pathologist responsible stored it for decades in mason jars within a beer cooler.

See how fireworks are made and learn how metals like magnesium and copper are responsible for different colors.