If we were still British colonies, we would not have waited until Japan attacked us to enter the war. It is conceivable that we would have gone to war with Germany as soon as the Nazis were firing on whichever British Ally that was attacked and invaded first.
Was it Poland?
Anyhoo..
Just because the French helped, that doesn't mean the Spanish couldn't have instead, in lieu of the French.
It is pure speculation on our parts to armchair quarterback how the Revolution would have played out without the aid of France. Were the odds against us? Certainly.
But the absence of France does not guarantee British Victory.
Please be aware... At the time France gave aid only 3% of the American population took up arms against the Crown., and guerilla warfare is an incredibly powerful counter to traditional European warfare.
If Half of the American population were to have been aroused to war... The British Redcoats would have been severely trounced.
The war was quite unpopular and there were very many neutral yet able forces that could have stepped up.
It is a common notion to underestimate what power the colonial Americans truely had.
Its great that heroism runs in the blood of British and American people... Who boldly dare and go in unarmed against gunman at that.