What are the main event which lead to the collapsed of soviet union ( the main point )

Gorbachev's decision to loosen the Soviet yoke on the countries of Eastern Europe created an independent, democratic momentum that led to the collapse of the Berlin Wall in November 1989, and then the overthrow of Communist rule throughout Eastern Europe.

Explanation:

for more info refer to this site

https://history.state.gov/milestones/1989-1992/collapse-soviet-union

the speech convinced americans that the ussr was an enemy, rather than an ally, which led to the creation of the truman doctrine.

major cities in delaware colony included wilmington and georgetown. major towns in new jersey colony included trenton and princeton. major towns in pennsylvania colony included philadelphia, lancaster, and york. major industry in the middle colonies included farming, forest and timber, coal, furs and iron ore.