The answer is (A.) Foreign Affairs.
"Under the Constitution, the President of the United States determines U.S. foreign policy. The Secretary of State, appointed by the President with the advice and consent of the Senate, is the President’s chief foreign affairs adviser. The Secretary carries out the President’s foreign policies through the State Department and the Foreign Service of the United States." To see more, look at https://www.state.gov/secretary/115194.htm
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The Marshall plan made sure Western Europe did not be put into a depression after WWII. The Marshall Plan was an injection of cash for countries.
He got a Nobel Peace Prize for it.
The United States gain freedom against the German when the Samoan civil war was over. The tripartite convention of 1899 concluded the second Samoan Civil War resulting in the formal partition of the Samoan archipelago into a German con colony and a United States territory.
Because of the “separate but equal” rule, segregation was legalized in the United States. This allowed separated schools, restaurants, water fountains, bathrooms, buses, etc. to continue discriminating against nonwhite people. The places designed for people of color were often of far worse quality and definitely *not* equal, but as long as white people claimed that it was, segregation was allowed to continue without any courts interfering.