Answer:
The anti-slavery movement
Explanation:
After escaping from slavery in Maryland, he became a national leader of the abolitionist movement in Massachusetts and New York, gaining note for his oratory and incisive antislavery writings.
On July 2, 1921, U.S. President Warren G. Harding signed the Knox–Porter Resolution, which had been passed by the U.S. Congress and ended the state of war between the U.S. and Germany, Austria and Hungary, further setting the stage for bilateral peace treaties.
