This was the compromise reached by Northern and Southern States on
the issue of how slaves should be counted toward the population? *

3/5th COMPROMISE

Explanation:

The Three-Fifths Compromise, Black Personhood, and Southern Representation. One issue that arose at the Constitutional Convention and almost derailed it was the issue of counting slaves for representation in Congress. ... The compromise reached was to count slaves as three-fifths of a person.

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