Castro made a treaty with Russia and Cuba got a hold of nuclear missiles. President Kennedy didnt want Cuba to have missiles so he sent troops to blockade Cuba. people involved were Castro, kruschev, and Kennedy.
North vietnam was communist and South Vietnam capitilist. north vietnam wanted to spread cummunism to the south. the south didnt want that and asked america for help. they sent troops but lost and left vietnam.
North Korea wanted to spread communism with the sound an reunite with each other. but the south wanted to have communism contained and not reach the south. people that were involved were Kim IL sung, and Syngman Rhee.
USSR cutoff land and water routes to take land from the Allied Powers that were in Berlin so we wouldnt fight a huge war. America flew supplies into Berlin to keep the land and not to surrender. People that were involved were Truman and Stalin.