History was a driving force behind such migration, since humans tended to move to new territory when they lacked food, shelter, or other resources--meaning that most of the conflicts throughout history have been driven by the same forces that drove migration out of Africa.
What happened when Hungary opened its borders is: Thousands of people left East Germany.
<h3>What happened when Hungary opened its borders?</h3>
When the border was open by Hungary or when they remove the regulation they placed on the border many people left east Germany and move to West Germany during that period.
The border opening also enables people to go to Austria to buy or purchase goods.
Therefore thousands of people left East Germany.
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Answer:
B. The President.
Explanation:
Congress can declare war.