who helped develop the constitution of the united states
(A Source Book) Of the 55 delegates, 39 signed the United States Constitution on September 17, 1787. One of the signers was John Dickinson of Delaware, who left the Convention but asked another delegate, George Read, to sign for him. William Jackson, the Convention secretary, witnessed the signatures.n 1777, John Jay of New York had helped write a constitution for his state. John Adams of Massachusetts had helped write the Massachusetts Constitution of 1780. Delegates to the Constitutional Convention in Philadelphia used many ideas and words from the constitutions of these and other states.