1775 – The first abolitionist society in U.S. was organized in Philadelphia with Ben Franklin as president.

Pennsylvania Society for Promoting

the Abolition of Slavery

In his later years, Benjamin Franklin became vocal as an abolitionist and in 1787 began to serve as President of the Pennsylvania Society for Promoting the Abolition of Slavery. This Constitution was enacted by Franklin just one month before he would join the Constitutional Convention of 1787 held in Philadelphia.

The Society was originally formed April 14, 1775, in Philadelphia, as The Society for the Relief of Free Negroes Unlawfully Held in Bondage; it was reorganized in 1784, and, in 1787, it enacted this constitution which appeared in print for the first time in this Philadelphia Magazine while the delegates were all assembled at the Constitutional Convention. The Society not only advocated the abolition of slavery, but made efforts to integrate freed slaves into American society.

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source: benjaminfranklin.org