Its a bit of a twist on your theme, BUT, during the American Revolution, my opinion is, that the greatest U.S. advancement was the SOLDIER. We went from an untrained, undisciplined collection of amateurs; into an actual Army. Of course, it took eight years for this transformation to occur. It was also in no small part, the genius of General Washington, bringing Von Steuben over to train the men at Valley Forge. There were many advancements prior to that time. (i.e. the flintlock replacing the matchlock and the development of rifling) But I must say that DURING the war the SOLDIER and the ARMY of the United States get my vote for the greatest advancement in weaponry. They were certainly the greatest weapon at Washington's disposal.
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