Monica Anderson, Pew Research, November 2, 2015

African immigrants make up a small share of the U.S. immigrant population, but their numbers are growing–roughly doubling every decade since 1970, according to a new Pew Research Center analysis of U.S. Census data.

There were 1.8 million African immigrants living in the U.S. in 2013, up from 881,000 in 2000 and a substantial increase from 1970, when the U.S. was home to only 80,000 foreign-born Africans. They accounted for 4.4% of the immigrant population in 2013, up from 0.8% in 1970.

The growth is evident among recently arrived immigrants. When compared with other major groups who arrived in the U.S. in the past five years, Africans had the fastest growth rate from 2000 to 2013, increasing by 41% during that period. (Africans are also a rapidly growing segment of the black immigrant population in the U.S., increasing by 137% from 2000 to 2013.)

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One factor behind this recent wave can be traced to the Refugee Act of 1980, which made it easier for those fleeing conflict-ridden areas, such as Somalia and Ethiopia, to resettle in the U.S. Back then, less than 1% of all refugee arrivals were from Africa, compared with 32% today, according to figures from the U.S. State Department’s Refugee Processing Center. Statistics from the Yearbook of Immigration Statistics confirm this point. Among refugee arrivals in 2013, five of the top 10 countries of nationality were in Africa: Somalia, the Democratic Republic of Congo, Sudan, Eritrea and Ethiopia.

African immigrants from the sub-Saharan region are also more likely than immigrants overall to enter the U.S. through the diversity visa program–an act passed in 1990 to encourage immigration from underrepresented nations. This legislation was initially intended to boost the number of Europeans migrating to the U.S., but many Africans have also benefited from the initiative.

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