<span>This led to the Gadsden Purchase, so choice (c) is the correct answer. The Mesilla Valley was claimed by both Mexico and the US, and eventually was purchased by the Minister to Mexico as a way of defusing the conflicts between the governor of New Mexico and the sitting Mexican president.</span>
The correct answer is the first amendment. It has the establishment clause which prevents the state from establishing any religion as the official religion of the country, making it completely secular. Any such attempt would be banned because it would be unconstitutional.
The correct answer should be B. To find a place for settlers to live and a new source of resources...
They didn't want to spread Christianity, that's what the Spaniards wanted. Domination and relationship building with the locals was not important to them. Another thing they wanted was freedom from prosecution so they just wanted to establish somewhere where the settlers will live safely.