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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 first 10 amendments were ratified in December 1791. The most recent amendment, which prohibits Congress from giving itself a pay raise, was ratified in May 1992. So how is the Constitution amended? Article 5 of the Constitution outlines the process for amending the document. There are two steps: proposal and ratification. Step 1: Proposing An Amendment. Either Congress or the states can propose an amendment to the Constitution. Both houses of Congress must propose the amendment with a two-thirds vote. This is how all current amendments have been offered.