The United States' boundaries have expanded over the centuries—and at the same time, Americans' ideas about their country have grown as well. The nation the world knows today was shaped by centuries of thinkers and events. Thomas Jefferson was one of the most important of these thinkers. During his presidency, the Louisiana Purchase doubled the geographic size of the United States. And perhaps most important, Jefferson helped define what is best about America.
Discusses Thomas Jefferson's role in expanding the boundaries of the U.S. through the Louisiana Purchase, and looks at other key events that took place during his presidency, including the Lewis and Clark expedition and the Embargo Act.
The United States' boundaries have expanded over the centuries—and at the same time, Americans' ideas about their country have grown as well. The nation the world knows today was shaped by centuries of thinkers and events. Thomas Jefferson was one of the most important of these thinkers. During his presidency, the Louisiana Purchase doubled the geographic size of the United States. And perhaps most important, Jefferson helped define what is best about America.
America was shaped by many great thinkers, including Thomas Jefferson, an important figure in the American Revolution. As the main writer of the Declaration of Independence, he helped define what is best about America. Learn more in Thomas Jefferson and the Growing United States, part of the How American Became America series.