Introduction.

Beganning at least as early as 1502 European slave Traders shipped more
  than 11 million slaves to the Americas. including 500.000 to what is now the United States .Initially  English Colonists relied on white indentured servants, but by the late 1600 faced with a shortage of servants they turn to the African slave. Three differient types of slavery emerged in the United States. in Maryland and in Virginia, you had the gang system, in the south you had the task system, and in the north  they were more farmers and household servants. The American Revolution had a contradictory consequences for slavery thousand of slaves freed themselfs by running away. In the South slavery became more entrenched, by contrast every Northern State freed slaves by statute or by court decision. In the United States eight U.S Presdients own Slaves.