Once an amendment has passed with a twothirds majority in both the House and Senate, the people of the state must vote in favor of it. Below you will find a list of all constitutional amendments that have appeared on the ballot since 1892 in the State of Washington.Article V of the United States Constitution outlines basic procedures for constitutional amendment. Below is an overview of constitutional amendment processes in the 50 states. I discuss the various possible ways of amending state constitutions. This essay examines Article V's procedures for amending the Constitution. It begins with an overview of the historical background of Article V. Ratified December 15, 1791. Therefore, it is very difficult to amend the Constitution. Necessity of a governor's approval, in the context of the state of Washington's apparent ratification of the 16th amendment (income tax).