The correct answer is B.fall of the Berlin Wall
The Prague Spring happened in the 60s, thirty years before the Soviet Union would actually fall. The fall of the Berlin wall showed that other countries can separate themselves from the Soviet's grasp and this led other countries, even those that were in the Union such as Lithuania to start fighting for their independence.
Well this questions is based on what you think.
During World War I, many African Americans living in the South moved to northern cities primarily because "<span>(1) more workers were needed in industry" in the north, which was friendlier to blacks as well. </span>