In Philadelphia, Pennsylvania, Anthony Benezet and 23 others establish the Society for the Relief of Free Negroes Unlawfully Held in Bondage. 

       [added 7/2/2021]

Subsequent Events:

11/14/1775                   8/21/1791                  3/3/1807

Authority:

“Law of the Jungle”
ccc-2point0.com/preface

References:

Pennsylvania Abolition Society – Wikipedia
en.wikipedia.org/wiki/Pennsylvania_Abolition_Society

First American abolition society founded in Philadelphia – HISTORY
www.history.com/this-day-in-history/first-american-abolition-society-founded-in-philadelphia

Current U.s. National Debt:

$36,167,124,467,492

Source