What did the berlin wall represent to most of the world?

Many scandinavians immigrated to the united states as a result of the homestead act of 1862, which offered land to independent farmers. this is an example of a push factor, because turmoil in scandinavia encouraged people to leave. push factor, because a new opportunity encouraged people to come to the us. pull factor, because turmoil in scandinavia encouraged people to leave. pull factor, because a new opportunity encouraged people to come to the us.

Which events are correlated but do not necessarily have a causal relationship?

What is zinn's approach to the study of history? what does he suggest occurs when history is told is the story of human progress?