The summer of 1787 was sticky hot. The flies were big—and biting. But delegates at the Constitutional Convention in Philadelphia, Pennsylvania, stayed focused. The men represented 12 of the then 13 U.S. states. (Rhode Island did not take part.) And they had a big job: to decide how the country would be run. They debated for 116 days. On September 17, 1787, they signed their names to the Constitution. The document is still the law of the land today, 236 years later.