The Soviet Union didn't do much invading of Eastern Europe during the Cold War. ... Gorbachev eventually refused to send Soviet troops to intervene in East Germany and Poland in 1989, effectively ending the Warsaw Pact as throughout 1989 and 1990 each country replaced its communist government.
A.to override presidential vetoes hope this helps :) !
Answer:
Technology; developed in systems of independent parts
Explanation:
There is no known reason as to why it started. I would say the soviet union is at fault because of Stalins desire to dominate the world under communism.
