What was an effect of the abolitionist movement? apex?

Abolitionist movement refers to the anti-slavery movement with the idea that all men are equal and with the goal to end the slavery in the United States and everyone to have personal freedom. The movement began in the 1920s.
One affect of the abolitionist movement is that it ended slavery in the United States.The 13th Amendment to the Constitution, declared on 18.12.1865, ended slavery in the United States