This is an article you’ll want to read. Here is a snippet from the intro:
As we know from our history books, the War for Independence began with the shots fired at Lexington and Concord. Those shots required gunpowder, a substance that was in short supply throughout the colonies. In 1775 there was only one American gunpowder mill, the Frankford Mill in Pennsylvania, and it was turning out a miniscule amount compared to what would be needed to wage a successful war. In addition, this mill was not turning out the high-quality powder needed for artillery use. If the Patriots were going to have any chance of victory, the colonies needed to step up production or import it. Had it not been for the French assistance in supplying the Americans with gunpowder from 1776 throughout the war, American forces would not have been able to fight and win the battles that they did.
Do read on!