Among colonist what group made the greatest contribution to the war effort during the American Revolution?

This is from the Holt Social Studies Textbook from school. It is not copied but it is papharsed so: Men and free African Americans fought in the war and women served as messengers, nusrses, and spies. One women name Deborah simpson dressed as a man to fight in the war and another women Molly Pitcher, brought water to the fighters, but when her husband was wounded she took his place loading cannons