The Constitution of the United States was made not merely for the generation that then existed, but for posterity—unlimited, undefined, endless, perpetual posterity.

Clay’s line frames the U.S. Constitution as a charter designed to outlast its framers and their immediate political disputes. By emphasizing “posterity—unlimited, undefined, endless, perpetual,” he argues for constitutional interpretation and national policy that consider long-term consequences rather than short-term factional advantage. The rhetoric also reflects Clay’s broader statesmanlike posture: presenting the Union and its fundamental law as an inheritance held in trust, to be preserved and adapted prudently for future Americans. In this view, constitutional government is not a temporary compact but an enduring framework meant to sustain a continuing people across generations.