Why did europeans suddenly turn to africa as a labor source for their colonies?

The Atlantic slave trade from Africa to the New World might well have been the largest maritime migration in history. The reason for this maritime movement was to obtain labour as the indigenous population of the New World had declined rapidly because of its lack of immunity against imported pathogens.

Explanation:

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During the earliest days of the American Revolution, General Washington believed that "c. soldiers’ short enlistment periods doomed colonial chances of victory", since he knew that the prospects of the US winning an early victory were slim.