In the case of the recent attacks against the Pentagon and Twin Trade Towers (code named “PENTTBOM" for Pentagon/Twin Trade/bomb), the Twin Trade Towers were most likely chosen because of their representation, at least in the eyes of the terrorists, of the City of New York and thus of the United States. Although Americans in general may not think of New York as symbolic of the United States, foreigners have always considered it in that light, and due to domination of the New York skyline by the Towers, this would have been, for them, a strike at the very heart of America. The Towers also would have represented such American ideals as strength, achievement, financial stability, capitalism and even democracy itself.
they were major centers for business, holding loads of money. there were thousands of people, and they were in one of the largest cities. they wanted to hit us where it hurt, and they did.
President Kennedy and Russian leader Nikita Khrushchev removed the missiles from Cuba and brought them back into the custody of the Soviet Union, which prevented an immediate threat of nuclear war.
Before Japan bombed parole harbor we didn't want to get involved in any of it. so the answer is D because that's when we got involved with other countries again.