The year in which the U.S. Constitution was ratified was 1788. This fundamental document established the framework for the federal government and defined the powers and responsibilities of each branch. It was ratified after intense debate and concern over individual rights and the potential for government overreach. The eventual addition of the Bill of Rights, comprising the first ten amendments, addressed these concerns, securing essential freedoms and protections for citizens. The Constitution has since served as a vital cornerstone of American democracy and governance.