Between 1870 and 1900, unprecedented numbers of Europeans immigrated to other countries.
So, your answer is option C. Immigrated to other countries.
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The NAACP (National Associantion for the Advancement for the Coloured People) and it was mainly present during the Civil Right's Movement. Therefore, they protested discrimination towards people of colour.
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Allowing free elections in eastern europe.
The Stamp Act was the first direct tax to colonists.