Louisiana became a state on April 30, 1812, nine years after the Louisiana Purchase was brokered between the United States and France. The purchase transferred control of 828,000 square miles of territory between the two countries, doubling the size of the United States.
The debate about the admission of Louisiana into the Union lasted from early 1811 through ratification, with issues of boundaries and the voting rights of the state being raised in both houses of the federal legislature.
Louisiana seceded from the Union on Jan. 26, 1861, joining with other states of the Confederacy in the American Civil War. The defeat of the Confederate States in 1865 brought Louisiana back under control of the United States.