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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.
State constitutions are more open to amendments. Amendments can be proposed by legislature, a constitutional commission or citizensâ petition and can be accepted by referendum. For example. the constitution of Massachusetts has been amended one hundred and twenty times.