What was the name of the 1803 land deal that greatly expanded the United States before America250?

The 1803 land deal that greatly expanded the United States before America250 was the Louisiana Purchase.

The United States acquired the territory from France for $15 million. The purchase covered about 828,000 square miles west of the Mississippi River, although its exact boundaries were later clarified through treaties and exploration.

President Thomas Jefferson authorized the acquisition after France offered to sell the entire Louisiana Territory. The deal more than doubled the size of the United States and gave the country control of the Mississippi River and the port of New Orleans, both crucial to western farmers and trade.

The purchase did not instantly settle every question about the land. Indigenous nations already lived throughout the territory, and the United States later pursued treaties, removals, surveys, and settlement policies that profoundly affected them. The Louisiana Purchase is often confused with the 1867 Alaska Purchase.