benito mussolini i believe
The main features of the Alliance System which existed in Europe in 1914 were born from fear that came about from militarization in the area. There were too many connections.
Your answer is the garrison in petrograd joining the soviets! :)
The political system that emerged was the rise of fascism. It is written at the ending of line 1 and beginning of line 2 (on the political right, fascism came out of the war).
The wall separated East Berlin and West Berlin. It was built in order to prevent people from fleeing East Berlin. In many ways it was the perfect symbol of the "Iron Curtain" that separated the democratic western countries and the communist countries of Eastern Europe throughout the Cold War.
while the chernobyl and gulf war killed thousands the wall was still way worse.