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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.
Congress' authority to set ratification deadline was affirmed by the United States Supreme Court in Coleman v. Miller, 307 U.S. 433 (1939). The mechanism for amending the United States Constitution was developed during the closing days of the 1787 Constitutional Convention at Philadelphia, Pennsylvania.his list contains proposed amendments to the United States Constitution. Article Five of the United States Constitution provides for two methods for proposing and two methods for the ratification of an amendment.