What caused the Soviet Union to break apart in 1991? 1.) nationalist/independence movements in places like Latvia, Ukraine and Lithuania formed and Soviet leader Mikhail Gorbachev decided not to use military force to stop them
2.)The U. S. launched multiple military interventions in satellite nations of Eastern Europe
3.)Mikhail Gorbachev signed treaties with the U. S. ending the Cold War
4.)The Soviet Union's military revolted and declared an end to communist rule