Answer: Reagan did not stop communism (communism never existed and its ideology is still here....there are many communist parties all over the world which is quite surprising and incredible) but practiced very well Kennan´s strategy of "containment". Communism itself underwent serious crises (1956 Hungary, 1968 Czechoslovakia, 80s in Poland) ...in 1980s there was a lot of dissatisfaction in the Eastern block, anti-communist opposition was growing and USSR became aware that reforms are necessary. Gorbatchev (from 1985) was really aware that the communist regimes are no longer sustainable. There were various factors.
Explanation: communist regimes exhausted themselves, nothing worked....economically and ideologically as well. That was something which helped very much to Reagan.
They reconciled it by creating a bicameral government that protected the interests of the majority and the minority in order to ensure that neither side is exploiting neither side. They also established the checks and balances system to prevent the government from being tyrannical.
1. Subsequent eras of history follow one another precisely with little overlap trends.
B because the placement of cuba would allow short range missiles hit any major city on the eastern seaboard and the gulf of mexico