The Free Soil Party was the first group to call out against slavery.
There were several such documents in circulation at the time, but the most famous and persuasive was Thomas Paine's "Common Sense" which told the colonists that it was impractical for the colonies to stay under British rule. <span />
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After Britain won the Seven Years' War and gained land in North America, it issued the Royal Proclamation of 1763, which prohibited American colonists from settling west of Appalachia. The Treaty of Paris, which marked the end of the French and Indian War, granted Britain a great deal of valuable North American land.
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It brought the Union closer to victory.
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