Congress called for a convention to be held in philadelphia in 1787 in order to

a) declare independence from england.

b) revise the articles of confederation. c) establish a new constitution for the united states.
d) direct the revolutionary war effort against england.

The purpose for a constitutional convention is to write a new constitution or review an existing one. The convention called by the congress in Philadelphia, in 1787 had the purose of establishing a new constitution for the United States. It was drafted and later ratified by all  the thirteen of the States in the original Union.

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