James Madison created the Virginia Plan, Three-Fifths Compromise, and Connecticut Compromise during the Constitutional Convention.
The ideas created by James Madison were the Virginia Plan, which proposed a bicameral legislative branch with representation based on population favoring larger states; the Three-Fifths Compromise, which counted slaves as three-fifths of a person for representation; and the Connecticut Compromise, which combined elements of the Virginia and New Jersey Plans by establishing a bicameral legislature with one house based on population and the other with equal representation for all states.
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