"During the same year in which these young women arrived" (1619 for Jamestown VA settlement) "another ship, bearing a very different sort of people, touched at Jamestown. It was a Dutch man-of-war, and from it twenty negroes were sold to the colonists. These were the first negro slaves in our country, and from their introduction dates the beginning of slavery, which in time brought about much trouble."
Quoted from Mc Masters Primary History of the United States (c) 1901, John Bach McMaster, Professor of American History in the University of Pennsylvania, American Book Company
2014
-1619
395
True. Not 400 years, 395. Ballpark, if not accurate.