mar 4, 1789 - US Constitution

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Written in 1787 by the Constitutional Convention and adopted in 1787-88, the Constitution went into effect on March 4, 1789, after ratification by nine states. It creates a federal government of three branches--legislative, executive, and judicial; separates powers among these branches and establishes a system of checks and balances among them; and defines the distribution of power between the federal government and the states.

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