I think it is the three-fifths compromise.
The war in North America was called King George's war. It happened because as Europeans fought each other, the fighting also transferred to the colonies and this war became the third of the 4 French-Indian wars.
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Communist party leader needed to retreat
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.
