He became a leader in the abolitionist movement, which sought to end the practice of slavery, before and during the Civil War. After that conflict and the Emancipation Proclamation of 1862, he continued to push for equality and human rights until his death in 1895.
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The Seminoles were the tribe that crossed the Gulf of Mexico to get to the Indian territory. They were forced to cross both the Gulf of Mexico and the Mississippi river. They were considered as one of the five civilized tribes that had to move from the place where they originally settled. I hope the answer helps.