The Cuban Missile Crisis struck fear in the world because there was great concern that the warheads in Cuba were nuclear and could destroy a large portion of the United States
Both the United States and the Soviet Union were hesitant to strike with their nuclear weapons, as each thought the other would be deterred in launching a first strike due to the threat of ultimate destruction
In 1975, the Soviet Union and the members of the free world signed the Helsinki Agreement, which promised economic cooperation and cultural exchanges between the East and West
Another flaw of the Helsinki Agreement was the West's recognition of the Eastern European nations that were under Soviet control, in return for the Soviets agreeing to allow the Eastern Europeans "human rights" while remaining under Soviet control
The Solidarity movement in Poland called for lower food prices, higher wages for workers, and the right for workers to organize and express their grievances
In 1989, Solidarity was legalized as a legitimate political party in Poland, and Solidarity candidates won the elections, leading to a non-communist government
The Soviet government realized it needed to win the people's trust, so a border crossing was opened up in East Berlin on November 9, 1989, leading to the fall of the Berlin Wall
The Reagan Doctrine was put to the test when Fidel Castro attempted to invade the mainland of South America via the island of Grenada, and Reagan sent American troops to defend the people of Grenada and arrest the Cuban rebels
Mikhail Gorbachev, the Soviet Premier, recognized that Russia possessed a powerful military but had fallen behind on everything else, and he introduced policies of perestroika and glasnost to reform the market, economy, and government
Under perestroika, Gorbachev let the people have private ownership of property, and under glasnost, he urged the Soviets to tell the truth and have regular press briefings
In July 1989, Gorbachev announced the USSR would no longer intervene in Eastern European affairs, allowing the people to demand change in their governments