On September 17, 1787, the Constitution of the United States was signed in Philadelphia, Pennsylvania. It should be noted, however, that the signatories did not thereby ratify their proposed new constitution for the union. The states had to ratify the document, which was done state by state. The document would not have passed enough states to take effect had not there been a promise to quickly pass a set of amendments, which became known as the Bill of Rights.
In 1849 on this same day in September, Harriet Tubman escaped to freedom in Philadelphia, but soon returned to Maryland to rescue her family. She made at least 13 trips into the slave-owning South to liberate more than 70 slaves before the Civil War — in which she served as a spy for the North.