Amendment 17: Senators -- How elected and how vacancies are filled. Amendment 18: National alcohol prohibition.Below is an overview of constitutional amendment processes in the 50 states. I discuss the various possible ways of amending state constitutions. The Arizona State Constitution has been updated to include the revised sections from the 55th Legislature, 1st Regular Session. The first ten amendments, known as the Bill of Rights, were passed in 1789. Below is the original text of the twenty-seven amendments to the Constitution. Arizona requires a simple majority to approve constitutional amendments. Arizona has statutory and constitutional initiatives, veto referendums, and legislatively referred amendments. There have been 27 amendments to the Constitution, beginning with the Bill of Rights, the first 10 amendments, ratified December 15, 1791.