Answer: B. The question of New Mexico's loyalty after the Revolt of 1847
Step-by-step explanation:
New Mexico was taken from Mexico in 1846 when Stephen Kearny induced the governor of the state to surrender. The following year, there was a rebellion in the territory as residents argued that they did not get proper representation from the government.
After this revolt - which was crushed by the American military - other Americans doubted the loyalty of the New Mexicans and considered them too unstable and unsafe to be a state which led to them being a territory until 1912.