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

The United States purchased the Louisiana Territory from France in 1803, which was a significant expansion of U.S. territory. This acquisition, known as the Louisiana Purchase, doubled the size of the nation and provided control over the Mississippi River, facilitating trade and westward expansion. The purchase consisted of approximately 828,000 square miles of land, which included parts of what are now 15 states, significantly affecting the geographic and economic landscape of the country. This strategic move laid the groundwork for future exploration and settlement, most famously exemplified by the Lewis and Clark expedition. The other options represent territories that either were not acquired in that year or were obtained through different means, such as treaties or annexation, making the Louisiana Territory the focal point of U.S. territorial growth in 1803.