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Britain passes the Stamp Act, imposing a tax on legal documents, newpapers, even playing cards. (First direct tax on the American colonists)
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The first shots of the Revolutionary War fired at Lexington and Concord in Massachusetts.
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The Declaration of Independence is adopted by the Second Continental Congress. Representatives make the break with Britain.
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The Treaty of Paris ratifies the independence of the 13 North American states.
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A convention of States in Phladelphia proposes the Constitution to replace the much looser central government operating under the Articles of Confederation (adopted in 1777)