What did the delegates agree that congress could and could not do?

QUICK ANSWERThe Constitutional Convention of 1787 in Philadelphia, also known as the Philadelphia Convention, agreed to terms that established the powers of Congress and rules regarding representation that are presently enacted. The Constitutional Convention of 1787 gave Congress the power to regulate the economy, the national defense system and the currency. The Philadelphia Convention also established the rules that dictated the representation each state would receive in the Congress. 

The significance of the result is the change