The Answer is D. Largely prohibited from entering the US prior to the 1940's
Immigrants :
The international movement of people to a country of which they are not natives or where they do not possess citizenship in order to settle as permanent residents or naturalized citizens.
No matter if that person has taken the citizenship of the destination country, served in its military, married a native, or has another status—he or she will forever be an international migrant.
The four types of immigrants are : citizens, residents, non-immigrants and undocumented.
Reasons for immigration-
People may choose to immigrate for a variety of reasons, such as employment opportunities, environmental factors, educational purposes, to escape a violent conflict, or to reunite with family, etc.
The Answer is D. Largely prohibited from entering the US prior to the 1940's
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