What was the 1803 United States acquisition from France called?

The 1803 United States acquisition from France was called the Louisiana Purchase.

The agreement transferred a vast territory west of the Mississippi River to the United States for $15 million. President Thomas Jefferson authorized the deal, which was negotiated by diplomats Robert Livingston and James Monroe with the French government of Napoleon Bonaparte. The treaty was signed in Paris on April 30, 1803, and the transfer was completed later that year.

The purchase nominally covered about 828,000 square miles, although its boundaries were not precisely surveyed and France did not exercise direct control over most of the land. The territory included the Mississippi River basin and eventually contributed to all or parts of fifteen modern U.S. states. Jefferson had initially sought access to New Orleans and navigation rights on the Mississippi, but the French offer expanded the negotiations dramatically. The acquisition roughly doubled the area claimed by the United States.