1803: Louisiana Purchase "Louisiana is purchased from Napoleon I by the United States for $15,000,000" -Source: Louisiana.gov
2
1812
1812: Louisiana Becomes a US State "Louisiana is admitted to the Union." - Source: Louisiana.gov
18 Jun 1812—17 Feb 1815: War of 1812 War of 1812, (June 18, 1812–February 17, 1815), conflict fought between the United States and Great Britain over British violations of U.S. maritime rights.
3
1828
28 Oct 1828: Great Depression Starts On this day, Black Friday, the stock market crashed and the Great Depression began.
1806 - 1831 (25 years)