The Congressional Apportionment Amendment (originally titled Article the First) is a proposed amendment to the United States Constitution, one of twelve proposed amendments to the United States Constitution approved by the 1st Congress on September 25, 1789, and 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 mandated decennial census. It is the only one of the twelve that has not been adopted, as it has not been ratified by enough states for it to become part of the Constitution. Ten of the proposed amendments (numbers 3 through 12) were adopted in 1791, becoming the First through Tenth Amendments to the Constitution, and collective