The Berlin Wall symbolized the division between East and West during the Cold War. Built in 1961, it separated East and West Berlin for 28 years until it was torn down in 1989, marking the reunification of Germany and the beginning of the end of the communist bloc. The document then discusses the origins and structure of the Soviet system and socialist bloc countries. It notes the bureaucratic and authoritarian nature of the Soviet system caused problems over time. Mikhail Gorbachev's reforms in the 1980s led to growing nationalism that contributed to the eventual dissolution of the Soviet Union in 1991. This ended the Cold War and changed global power dynamics, leaving the US as the dominant superpower amid the transition of former Soviet states to capitalist dem