Basically the Cold War began after WWII. The United States and the Soviet Union were once allies in WWII. Now the two superpowers did not get along as the Communists took over Eastern Europe. The Soviets became allies with the new Communist Cuba. The US considered this a severe threat because it was only 90 miles from the United States. The US added missiles in Turkey pointing at the U.S.S.R. And the soviets done the same in Cuba. Both were involved in the Korea War and the Vietnam war. In Korea it was split into the DPRK (The North and the soviet lead state) and (ROK) (The South which was lead by the US). In Vietnam it was split and that was the only war the US ever lost. China also came under communist rule and kicked the Nationalist party to Taiwan.
