Tiananmen Square
The fall of the Berlin Wall
Anti-Apartheid movement
The correct answer is B: Immigration was based on the national origins quota system. The National Origins Act was a United States federal law that set the amount of immigrants from certain countries that were allowed to enter the U.S. Admission to the U.S was determined by ethnic identity and national origin. It reduced the number of southern and eastern Europeans and excluded Asians entering the country.
Because it was controlled by Russia who were communist, and the west was controlled by the US which was helping them develop their country again
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