<Tr> <Td> </Td> <Td> Colorado Territory established </Td> <Td> February 28, 1861 </Td> </Tr> <Tr> <Td> </Td> <Td> Arizona Territory established </Td> <Td> February 24, 1863 </Td> </Tr> <Tr> <Td> </Td> <Td> Statehood </Td> <Td> January 6, 1912 </Td> </Tr> <P> The Territory of New Mexico was an organized incorporated territory of the United States that existed (with varying boundaries) from September 9, 1850, until January 6, 1912, when the remaining extent of the territory was admitted to the Union as the State of New Mexico, making it the longest - lived organized incorporated territory of the United States, lasting approximately 62 years . </P>

In the early 1800s the territory of new mexico included texas and california