The Cold War began after World War 2 and was a decades-long conflict between the United States and its allies against the Soviet Union and its allies. Though they never directly fought each other, tensions escalated over issues like the division of Germany and Berlin, nuclear weapons development, and proxy wars. By the late 1980s, the Soviet Union's economy had stagnated while American influence grew globally, contributing to reforms under Gorbachev and the eventual collapse of the Soviet Union in 1991, bringing an end to the Cold War.