As a result of a lack of interstate economic cooperation, representatives from five states met in Annapolis, Maryland, in 1786 to discuss the matter. The main outcome of the Annapolis Convention was

Constitutional convention in Philadelphia

Explanation:

During the Annapolis convention that was held in Maryland, in 1786, in which twelve delegates came from five states to seek a solution to the fundamental issues concerning lack of interstate economic cooperation. They eventually agreed to the further extensive Constitutional Convention which was later held in 1787 in Philadelphia.

Hence, in this case, the correct answer is "Constitutional Convention in Philadelphia"

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