Try going here ig,
<span>foundersstory.carnegie.org</span>
The event that preceded the revolutions of 1989 is that gorbachev made reforms in the soviet union.Mikhail gorbachev was the eight and the final leader in the soviet union. gorbachev's policies of glasnost and perestroika and his reorientation of soviet strategic aims contributed to the end of the cold war.
They were all products of Enlightenment philosophies.