<Tr> <Th> July 17, 1911 </Th> <Td> Naval Station, Tutuila, was renamed American Samoa; the station continued to operate separate from territorial governance until 1951 . </Td> <Td> Pacific Ocean: </Td> </Tr> <Tr> <Th> January 6, 1912 </Th> <Td> New Mexico Territory was admitted as the forty - seventh state, New Mexico . </Td> <Td> </Td> </Tr> <Tr> <Th> February 14, 1912 </Th> <Td> Arizona Territory was admitted as the forty - eighth state, Arizona . </Td> <Td> </Td> </Tr> <Tr> <Th> August 24, 1912 </Th> <Td> The District of Alaska was reorganized as the Alaska Territory . </Td> <Td> Northwestern North America: </Td> </Tr>

How did the boundaries of the united states change during the 1840s