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The United States Constitution can be changed informally. Informal amendments mean that the Constitution does not specifically list these processes as forms of amending the Constitution, but because of change in society or judicial review changed the rule of law de facto.
Article V of the United States Constitution provides authority and instructions for amending the Constitution. Amendments can be proposed by Congress or by constitutional convention. Congress then decides how to ratify the amendment if approved by Congress or convention.The amendment can either be ratified by three-fourths of state legislatures or by conventions in three-fourths of the states.ongress can propose an amendment to the Constitution by passing a joint resolution. Two thirds of both the House of Representatives and the Senate must approve the resolution. 1  The resolution does not have to be approved by the President, who has no required role in the amendment process.