Slaves were brought to work in the colonies for many reasons, although the most important reasons were to harvest crops, help families, raise children, and give birth to more slaves.
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The Treaty of Paris of 1763 was very much significant for the Americans as it formally ended the American Revolutionary War. In the terms of the treaty, France gave up all its territories in mainland North America, effectively ending any foreign military threat to the British colonies there.
After the treaty, The British acknowledged the independence of the United States and the colonial empire of Great Britain was destroyed in North America.