This abolitionist was born a slave in Maryland. He eventually settled in New York City and became a Presbyterian minister. In his "Address to the Slaves," he famously demanded that slaves claim their freedom, regardless of the violence that might follow. He later founded the African Civilization Society and urged black people to migrate to Africa and help build an independent Africa. He was:

Henry Highland Garnet

Explanation:

Henry Highland Garnet escaped as a child from slavery along with his family in Maryland, and later moved to New York City. He was a Presbyterian minister, and based his drive for abolitionism on his faith. He later founded the African Civilization society and sought to establish colonies in West Africa.

whose power in the senate is equal to the power of the speaker of the house?

profound political, administrative, and social changes in the british isles.