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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 Seven says that the new government under the Constitution would not start until conventions in at least nine states approved the Constitution. Amendments. Since 1787, Congress has written 33 amendments to change the Constitution, but the states have ratified only 27 of them. The first ten amendments are called the Bill of Rights. They were argued over during the Constitutional Convention of 1787, but it wasn't until 1791 that they were ratified by two-thirds of the states.