In what year did the United States buy the Louisiana Territory from France?

1. The United States bought the Louisiana Territory from France. 2. The year of that purchase was 1803. 3. The year 1812 is the year of a war, not the year of the purchase. 4. The years 1776 and 1787 belong to the Declaration of Independence and the Constitution, both earlier than the purchase. _Source: USCIS Civics Flash Cards M-623 (rev. 02/12), public domain, official civics question 71_