Amendments to this Constitution may be initiated in either house of the General Assembly. Below is an overview of constitutional amendment processes in the 50 states.I discuss the various possible ways of amending state constitutions. The first step to amending the Illinois Constitution is a Joint Resolution being filed in either the Illinois House or Illinois Senate. Article V: The Congress, whenever two thirds of both houses shall deem it necessary, shall propose amendments to this Constitution. Through initiated constitutional amendments put on the ballot through a citizen signature petition. Eighteen states allow this method of amendment. If you fill out a form on a webpage, you will lose your progress. Object Description ; Title, Amending Process ; Creator, Illinois. The right to due process of law and equal protection of the law now applied to both the federal and state governments.