Question: when did new mexico became a territory of the united states
Answer: 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 .