It is due to i believe the rise of cotton
Mediterranean and the Red seas
Because that's where the colonizers came from and they didn't have much when they got here.
Nixon claimed (the answer is D.) executive privilege. Because
it would be risky in national security or because to be contrary to the
interests of the Executive Branch. Presidents have assert the right of executive privilege when they have information they
want to keep private.
U.S. foreign policy shifted away from "isolationish" to international involvement, mostly during and after World War II, when the United States emerged as the most powerful country on earth.