<Tr> <Th> July 10, 1821 </Th> <Td> East Florida was formally transferred to the United States by Spain . </Td> <Td> </Td> </Tr> <Tr> <Th> July 17, 1821 </Th> <Td> West Florida was formally transferred to the United States by Spain . </Td> <Td> </Td> </Tr> <Tr> <Th> August 10, 1821 </Th> <Td> The southeastern corner of Missouri Territory was admitted as the twenty - fourth state, Missouri, the rest becoming unorganized territory . It was defined as the area south of a line west from the Des Moines Rapids, and east of a line south from the mouth of the Kansas River . </Td> <Td> </Td> </Tr> <Tr> <Th> March 30, 1822 </Th> <Td> The former East Florida and West Florida were organized as Florida Territory . </Td> <Td> </Td> </Tr>

What are some land areas that were added to the united states after 1790