Answer:
C. You will be treated the same in return.
Explanation:
Karma is the principle of cause and effect. So whatever you say/think/do, contributes to karma.
Well, the moment the US intervened with the affairs of the World was the moment that the US could not go back to an isolationist policy. The US simply cannot afford to stop playing a role in world affairs, due to the fact that the US is a capitalist society and that the US has a lot of exports/imports. Unless the US can reach a level of capacity where it is self sufficient, which is currently impossible to do, the US must participate in the affairs of the World in order to survive.
The Mexican war led to the capture of Arizona, New Mexico, Texas, and a part of California. Hope this helps.