...orgia, 16,000. Total in 1776,502,132. The first introduction of African slaves was in 1620, by a Dutch vessel which brought twenty from Africa to Virginia. In his work upon the slave trade, Mr. Carey , of Pennsylvania, says "the trade in negro slaves to the American colonies was too small before 1750 to attract attention." The same writer says that the slaves numbered 55,850 in 1714 of which 30,0...