The answer is D.
A war in Mexico would fall under northern command. Northern commands was created by secretary of defense Rumsfeld in respond to war on terrorism and national security. It covers Canada, the United States of America, and Mexico.
There would be unlikely that Mexico would pick a war againts U.S.A though
Answer: politics
Explanation: because they tell people what is going on in the world and about the civic responsibilities
This would be B. negotiating with foreign nations. The other three have the would community in them or something similar. B is something the federal government would deal with.