Seems the answer would be D.
In order for a nation to exist, the statement that must be TRUE is the country must be free to exercise sovereignty in handling its own affairs. The correct answer is D.
William M.Tweed was the leader of Tammany hall
The action that has come to symbolize the end of the Cold War is 3. tearing down the Berlin Wall. The Wall had been formed by the Soviet Union to separate East Berlin (Soviet-controlled) from West Berlin (Western-controlled). Its fall allowed Berliners (and Germans) from the Eastern half finally make their way to the Western half.