Key facts about black immigrants in the U.S. -- Pew Research Center

The United States has long had a sizable black population because of the transatlantic slave trade beginning in the 16th century. But significant voluntary black migration is a relatively new development – and one that has increased rapidly over the past two decades. Here's a closer look at the small, yet growing, black immigrant population in the U.S.: ....
http://www.pewresearch.org/fact-tank/2018/01/24/key-facts-about-black-immigrants-in-the-u-s/