The Topic And Research question: Why did the fall of the Berlin Wall trigger the

The Topic And Research question: Why did the fall of the Berlin Wall trigger the collapse of Communism in Eastern Europe?
(Course Descriiption: Explores the history of Communism from its origins in Marxist theory to the rise and fall of Communist systems in Europe and around the world. Analyzes the history of selected Communist states, movements and leaders)
Assignment: Structure clear and persuasive, evidence based, arguments on Communism.
One of your writers, wrote a research proposal for me, which i will attach below as reference, just keep the feedback of the proposal in mind (I will paste it below)
“You are reaching too far. Your research question is way too broad. Rephrase it thusly.
Why did the fall of the Berlin Wall trigger the collapse of Communism in Eastern Europe?
This will keep you paper more focused and still allow you to talk about the common problems with communism in Eastern Europe.
Your sources lean to heavily on what happened long term after the fall of the wall. You need more on what weaknesses led up to it.”