What role did new mexicans play in the civil war?

The New Mexico Territory, which included the areas which became the modern U.S. states of New Mexico and Arizona as well as the southern part of Nevada, played a role in the Trans-Mississippi Theater of the American Civil War. Both Confederate and Union governments claimed ownership and territorial rights over it. The first proposal dates from a conference held in Tucson that convened on August 29, 1856. The conference issued a petition to the U.S. Congress, signed by 256 people, requesting organization of the territory and elected Nathan P. Cooke as the territorial delegate to Congress.

Ithink the answer is b