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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.
The Constitution has been amended 27 times, including the Bill of Rights. Amendments may be proposed by two-thirds of each house of Congress or by a national convention called by Congress at the request of the legislatures in two thirds of the states.