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In page Abolitionism in the United States:

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The Catholic Church in the United States had long ties[citation needed] in slaveholding Maryland and Louisiana. Despite a firm stand for the spiritual equality of black people, and the resounding condemnation of slavery by Pope Gregory XVI in his bull In supremo apostolatus issued in 1839, the American church continued in deeds, if not in public discourse, to avoid confrontation with slave-holding interests. In 1861, the Archbishop of New York wrote to Secretary of War Cameron: "That the Church is opposed to slavery ... Her doctrine on that subject is, that it is a crime to reduce men naturally free to a condition of servitude and bondage, as slaves." No American bishop supported extra-political abolition or interference with states' rights before the Civil War.