The correct answer to this open question is the following.
The polices or strategies that President Reagan implemented that led to the fall of the Soviet Union were the following. First, President Ronald Reagan started to use a discourse aimed to publicly criticize the Soviet Union and questioned the morality of its leaders that still maintained the separation of Europe with the Berlin Wall. His foreign policy known as the Reagan Doctrine supported opposition groups not only in Eastern Europe but in the Middle East. Reagon also created the space defense program, commonly called "Star Wars" to pressure the USSR leaders.
On the other hand, Soviet leader Mikhail Gorbachev established two important politics and programs that led to the fall of the Soviet Union. One was Perestroika, a series of political and economic reforms to modernize Russia and the other one was Glasnost, a policy to open and show transparency in the USRR politics. The Soviet Union collapsed on December 26, 1991.