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In 1690, there were an estimated 13,000 black slaves. The population grew at an annual rate of over 3% throughout the 18th century, doubling every 25 years or less. [ 5 ] : x By 1775 the population had grown to 6.1 million, of which 2.1 million were white, 540,000 black and 3.5 million Native American, giving the colonies about one-third of the ...