The party leader is typically responsible for managing the party's relationship with the general public. As such, they will take a leading role in developing and communicating party policy, especially election platforms, to the electorate.
Answer:
They worried about upsetting the Native Americans, who had a better relationship with the Mexicans than they did with the Americans.
Explanation:
Yes because of the mountainous area which can be a great danger for ambush.
Mexico claimed it before 1821, but after im pretty sure only america claimed new mexico