"In the American Revolutionary War (1775"1783), France fought alongside the United States, against Britain, from 1778. French money, munitions, soldiers and naval forces proved essential to America's victory over the Crown, but France gained little except large debts."
France, Spain and the Dutch Republic all secretly provided supplies, ammunition and weapons to the revolutionaries starting early in 1776.
The war was ended in Paris, France.
An interesting historical side note. If there had been a transatlantic telegraph at that time, the Boston Tea Party would have been averted. The war itself would have been averted. The United States would still be a under British rule.