The Congressional Apportionment Amendment (originally titled Article the First) is a proposed amendment to the United States Constitution. It was one of twelve "articles of amendment" to the United States Constitution approved by the 1st Congress on September 25, 1789. They were sent to the legislatures of the several states for ratification. If adopted, it would establish a formula for determining the appropriate size of the House of Representatives following each constitutionally required wikt:decennial census. It is the only one of the twelve proposed amendments that has not been adopted, as it has not been ratified by enough states for it to become part of the Constitution.