Why were slaves important to jamestown

The first slaves were introduced into the English-American colonies by a Dutch trader, who, in 1619, sold twenty of them to the settlers at Jamestown, Va.

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.