The French didn't get involved directly with the revolutionary war until then, but the greater impact was war with France in Canada and the Seven Years' War, which pulled British resources away from the New World.

Without France as a belligerent to England in the years up to the war, the latter would have been far better equipped to defend the colonies.

The David versus Goliath mythology that tells of feisty upstart democratic republic felling the great monarchy taught in school typically doesn't get into a Great Britain heavily depleted and indebted from years of war with France.