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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.
There are a couple ways that the U.S. Constitution could be formally amended. First Congress could adopt a proposed amendment (2/3 majority vote in both House of Representatives and Senate) and then send that proposed amendment to the state legislatures to be adopted - 3/4 majority required.