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"Black Migration, Both Slave And Free" by Felicia R. Lee, is an article (reproduced in the continuation, below) that appears in the New York Times, Feb. 2, 2005, with photo above, captioned "An early 19th-century print of slaves in Brazil," from "In Motion: The African-American Migration Experience," the exhibit referred to below [click photo to enlarge]:
The subject of the article is the opening of an exhibition at the Schomburg Center of a three-year project costing $2.4 million, of what is called probably the largest single documentation of the migration of all people of African ancestry in North America, according to Howard Dodson, director of the N.Y. Public Library's Schomburg Center for Research in Black Culture in Harlem.
Here's the web-site.
Do not make the mistake of thinking that black migration was confined to a particular era. The study is organized around no less than thirteen migrations, two of them involuntary: the domestic and the trans-Atlantic slave trades. What are the others? North to South, South to North, Caribbean to Mainland, sub-Saharan, etc.
"Twice as many sub-Saharan Africans have migrated to the United States in the past 30 years as during the entire era of the trans-Atlantic slave-trade, project organizers say," according to the NYT.