After the Emancipation proclamation, the union army actively began recruiting African american soldiers to fight. Emancipation proclamation was a presidential proclamation and an executive order given by president Abraham Lincoln in 1963 which changed the federal legal status of people enslaved in the designated areas of the south to become free.
Opposition to mainstream catholic controversies such as sales of indulgences, and the publication of his works John Calvin benefited from the printing press a great deal. several of his ideas were published and translated into different languages and therefore reached a great deal of people, similar to the Lutheran thoughts that had also benefited from the printing press.
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I think the answer to this is letter B
