The cargo of Black Sheep came from the West African coast & rivers & the shores & banks of those waters were one of the points in the triangle of the slave trade. The yankee clippers painted their masts & yards white & "they shown like silver, she fires her guns, can't ya hear the racket". From Africa they'd sail to the West Indies & other islands groups & sell off the slaves & bring Molasses (see The Great Molasses flood-Boston) to New England. Barry