From Ohio History Central
The Ohio Constitution of 1803 was Ohio's first state constitution.
In November 1802, thirty-five delegates convened to draft an Ohio state constitution. In order for Ohio to become a state in the United States, representatives of the territory had to submit a constitution to the United States Congress for approval. This was the final requirement under the Northwest Ordinance that Ohio had to meet before becoming a state. Thomas Worthington personally carried the document to Washington, DC. He arrived on December 19, and formally presented the Constitution to Congress on December 22. The Constitution became law on February 19, 1803, when Congress passed an act stating that the citizens of Ohio had adopted a constitution in accordance with the 1802 Enabling Act and the said state had become one of the United States of America.