What territory did the United States buy from France in 1803?

The United States purchased the Louisiana Territory from France in 1803, a key event known as the Louisiana Purchase. This acquisition significantly expanded the size of the United States, adding approximately 828,000 square miles of territory west of the Mississippi River. The deal was completed for about $15 million, which was a substantial sum at the time, but it was considered a great bargain that doubled the nation's land area.

The Louisiana Purchase opened up vast tracts of land for exploration and settlement, and it played a crucial role in America's westward expansion. It also provided the U.S. with control over the Mississippi River and the port of New Orleans, essential for trade and transportation. This purchase laid the groundwork for future growth and development of the nation, making it a pivotal moment in American history.