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On April 30, 1789, George Washington took the oath of office as the first president of the United States at Federal Hall in New York City, the nation’s capital at the time. Washington had already devoted a lifetime of service to his country, most notably as commander-in-chief of the Continental Army during the American Revolution. As president, Washington set many important precedents, including the tradition of a peaceful transition of power after two four-year terms.

Explore George Washington’s Life:

  • Federal Hall: Located on Wall Street in New York City, Federal Hall was home to the first Congress of the United States, and the place where George Washington was sworn into office as president. Visit www.nps.gov/feha/index.htm for more information.
  • Mount Vernon: George Washington’s home and estate in Mount Vernon, Virginia is a national treasure, with a world-class museum and education center on the life of our first president. Visit www.mountvernon.org for more information.

The United States Constitution created a representative legislature that was empowered to write and to pass new laws. Known as the Congress, the legislature consisted of two parts: the House of Representatives, in which states were awarded seats proportional to their populations, and the Senate, in which each state was represented equally with two seats. In 1790, the Congress created a national capital city in a new federal district called Columbia, situated on the Potomac River between Maryland and Virginia. The next year, the city was named Washington, after the country’s first president. Construction on the Capitol building, where Congress would convene, began here in 1793.

Explore Washington, D.C.:

  • Washington Monument: Visit one of the most popular attractions in Washington, D.C., and get a bird's eye view of the nation's capital from the Washington Monument, a towering tribute to George Washington and the tallest structure in the city. Visit www.nps.gov/wamo/index.htm for more information.
  • United States Capitol: Visit the meeting place of the United States Congress to understand what makes representative democracy unique. Visit www.visitthecapitol.gov for more information.

In addition to the Congress, the Constitution created an executive branch of government headed by the president. The president was responsible for administering the country’s laws, but he also had the power to veto, or reject, new legislation passed by Congress instead of signing it into law. This ensured that Congress and the president had to work together to govern the nation. Construction on the executive mansion began in 1792, and in 1800 President John Adams became the first chief executive to reside there with his family. The building was not officially known as the White House until 1901.

Explore the White House:

  • The White House: Enjoy a tour of the most famous home in America, while learning about the many changes that the White House has undergone since President John Adams first occupied the residence. Visit www.whitehouse.gov/about/tours-and-events for more information.

Louisiana Purchase

In the early years of the United States, Spain and then France claimed Louisiana and the territory west of the Mississippi River. At the beginning of the 19th century, the region became more difficult for France to maintain, and it negotiated to sell the land, including the important port city of New Orleans, to the U.S. In 1803, President Thomas Jefferson agreed to purchase this enormous territory, nearly doubling the size of the country for the bargain price of $15 million. The treaty was signed in Paris on April 30, 1803, and the transfer ceremony took place the following December in New Orleans, Louisiana.

Explore the Louisiana Purchase:

Following the Louisiana Purchase in 1803, President Jefferson decided to send an expedition to explore the new territory and identify a water route across the continent. He turned to his personal aide, Meriwether Lewis, to head the expedition due to Lewis’s experience as an Army captain and his knowledge of the western frontier. Lewis, knowing he would need help leading the expedition, asked his mentor from the Army, William Clark, to join him.

Explore Thomas Jefferson’s Life:

  • Monticello: Discover the home that Thomas Jefferson began building in 1768 and continued to work on for more than forty years. Here you can see innovative architectural design, beautiful furnishings, and artifacts from the Lewis and Clark expedition. Visit www.monticello.org for more information.

In the winter of 1803-1804, the Corps of Discovery (explorers who participated in the Lewis and Clark expedition) assembled at Camp Wood in modern-day Illinois to prepare for the long journey west. About 30 men spent the winter there on the Missouri River, along with William Clark who took charge of their training and packing. In May of 1804, Lewis and Clark and the Corps of Discovery embarked on their trip up the Missouri River in one large keelboat and two smaller vessels.

Explore the Corps of Discovery:

  • The Lewis & Clark Boat House and Nature Center: This museum dedicated to the Lewis and Clark expedition sits on the Missouri River in St. Charles, Missouri, not far from where the Corps of Discovery embarked on its journey. Visit www.lewisandclarkcenter.org for more information.

On July 4, 1804, one and a half months into their journey up the Missouri River, the explorers held the first ever Independence Day celebration west of the Mississippi at their camp in modern-day Kansas. They marked the occasion by firing their ship’s cannon at sunset.

Explore Lewis and Clark’s Fourth of July Celebration:

  • Independence Creek-Lewis & Clark Historic Site. The Corps of Discovery stopped at this small tributary on July 4, 1804, and named it in honor of the occasion. The site also features a reconstruction of a Kanza Indian home, since the explorers report in their journals that they spent the night near an abandoned Kanza village. Visit www.travelks.com/listings/Independence-Creek-Lewis-Clark-Historic-Site/13157/ for more information.

The Corps of Discovery made slow progress on the Missouri River throughout the summer and early autumn of 1804, and by October the expedition had reached current-day North Dakota. There, among the Hidatsa tribe, they met a French-Canadian trapper named Toussaint Charbonneau who lived in the village and was married to a young Shoshone woman believed to have been kidnapped and brought to live with the Hidatsa. Her name was Sacagawea. Lewis and Clark promptly hired Toussaint and Sacagawea as translators, and the couple joined the Corps going forward.

Explore Sacagawea’s Homeland:

  • Sacajawea Center: This education center outside of Salmon, Idaho is dedicated to preserving the legacy of Sacagawea. Visit www.sacajaweacenter.org for more information.

Sacagawea and her husband joined the Corps of Discovery at Fort Mandan, where the group spent the winter of 1804-1805. The explorers developed good relations with the local Mandan villages and other nearby tribes. William Clark recounts in his journal how, on New Years Day of 1805, sixteen of the men visited one of the villages to dance and play music at the request of the chiefs. Later that winter, Sacagawea gave birth to a son at Fort Mandan, whom she brought with her when the expedition continued later that spring.

Explore Fort Mandan:

  • The North Dakota Lewis and Clark Interpretive Center: Located in Washburn, North Dakota, this reconstruction of Lewis and Clark’s Fort Mandan offers a glimpse of what life was like on their expedition. Visit www.fortmandan.com for more information. .

One of the most important aspects of the Lewis and Clark expedition was its scientific mission. Both men took careful notes on every aspect of their trip, describing hundreds of native plants and animals, as well as the people they encountered. Lewis and Clark sent dozens of specimens and artifacts back to President Jefferson to be studied more closely -- including a few live animals. In April 1805 in current-day Montana, the expedition encountered and killed a grizzly bear. It was the first time the species had been described for science.

Explore Lewis and Clark’s Scientific Mission:

  • Academy of Natural Sciences: Most of the specimens Lewis and Clark sent back from their journey were deposited at the Academy of Natural Sciences in Philadelphia, Pennsylvania where the collection remains on display. Visit www.ansp.org for more information.

The expedition met the Nez Perce after crossing the Rocky Mountains near the borders of modern-day Idaho and Montana. The tribe welcomed the tired group with hospitality, offering food and advice about the journey ahead to the Pacific. Lewis and Clark decided during their stay to leave their horses with the Nez Perce and to continue with the remainder of the trip by river. Observing the explorers struggling to build new boats, the group’s new friends taught them to hollow out canoes using controlled fires. Eight months later, on their return journey, Lewis and Clark met the Nez Perce again when stopping to pick up the horses they had left in the tribe’s care.

Explore Lewis and Clark’s Encounter with the Nez Perce:

  • Nez Perce National Historical Park. See where the Lewis and Clark expedition camped with the Nez Perce. Visit www.nps.gov/nepe for more information.

On November 15, 1805, in what is now Washington state, the Corps of Discovery finally reached the Pacific Ocean. Since it was late in the year, the team resolved to stay on the west coast for the winter. Every member of the expedition, including Sacagawea and William Clark’s slave, York, voted on the best site to construct their camp, which became known as Fort Clatsop. This would be the final winter of the expedition. In March 1806, they packed up and began the long journey home. They did not arrive back in St. Louis until the end of September 1806.

Explore Lewis and Clark’s Pacific Coast:

The United States began growing almost as soon as it became a country. Many of the original thirteen colonies ceded their expansive western frontiers to the federal government in the years following the American Revolution, and from these, along with land acquired from British Canada and the Louisiana Purchase, the government formed several territories. The territories organized their own legislatures and once they reached a sufficient population, they petitioned for statehood. After the thirteen original colonies, Vermont, Kentucky, Tennessee, and Ohio were admitted to the union by the end of Jefferson’s presidency in 1809.

Explore the Beginnings of Westward Expansion:

The inventor Robert Fulton designed the world’s first commercially viable steamboat, the Clermont, which embarked on its first trip up the Hudson River from New York to Albany in August 1807. Before long, steamboats became a vital mode of transportation throughout the United States. The Mississippi River got its first steamboat, the New Orleans (another Fulton ship), in 1811, and within two decades the river was host to hundreds of others. This innovation proved invaluable to the commercial and territorial expansion of the United States.

Explore the History of the Steamboat:

  • The Hudson River Maritime Museum: Learn about the Clermont, Robert Fulton’s first steamboat in Kingston, New York. Visit www.hrmm.org/ for more information.
  • The Mississippi River Museum at Mud Island: Learn about the history of the Mississippi River and board replica steamboats in Memphis, Tennessee. Visit www.mudisland.com for more information.

In the decades following the Louisiana Purchase, millions of Americans moved west to start new lives for themselves and their families in territories stretching all the way to the Pacific Ocean. Many settlers travelled in caravans called wagon trains, most famously on the Oregon Trail over a route similar to the one Lewis and Clark had pioneered. America’s expansion did not come without costs, however. With each new territory, Americans confronted the contentious question of whether slavery would be allowed. Moreover, as settlers migrated west they displaced many native people who were there before they arrived. Eventually, relations between the settlers and the Native Americans deteriorated to the point that the U.S. government relocated many tribes into designated areas known as reservations. Our country still struggles with the consequences of these actions today. There is no doubt, however, that the courage of the early pioneers eventually helped extend the freedoms guaranteed in our Constitution, to everyone from coast to coast.

Explore the Legacy of Westward Expansion:

  • The National Frontier Trails Museum: Learn about the Oregon, Santa Fe, and California Trails, which originated in Independence, Missouri. Visit www.ci.independence.mo.us/NFTM/ for more information.
  • National Museum of the American Indian: Learn about the history of Native Americans at this inspiring museum on the National Mall in Washington, D.C. Visit www.nmai.si.edu/home for more information.

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