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On April 30, 1812, exactly nine years after the signing of the Louisiana Purchase, Congress admitted Louisiana as the eighteenth state in the Union.The convention requested that Congress add the Florida parishes to the new state, and Congress honored this request.n April 30, 1812, exactly nine years after the signing of the Louisiana Purchase, Congress admitted Louisiana as the eighteenth state in the Union.
When did Louisiana become a state? A: Louisiana became a state on April 30, 1812, nine years after the Louisiana Purchase was brokered between the United States and France. The purchase transfe... Full Answer >