Not so many, actually.
While the slave trade was legal internationally, much of the Middle Passage was sailed by foreign-flagged vessels -- England, Spain, Portugal.
U.S.-flagged vessels (including slavers) were owned mostly by New England shipping interests.
What the chart also does not show is that the preponderance of the trade was carried into the Carribbean and South American sugar plantations, not to North America.
Oops -- my mistake. The chart DOES show that.
I need to get a larger display or better glasses.8{)
The New Englanders realized it was to cold up there..for slavery..they sold their slaves to the South..built slave ships..rum distilleries, planted grain to make the rum..imported White slave labor from Ireland..
We know the story..
Geez, I hope this doesn’t get out. All of the textbooks in our schools will have to be re-written. According to existing text, all of the slave ships belonged to the ancestors of George Bush from Texas and every slave captured by the Texas Rangers in Africa came to the market in South Carolina. /s