How much was 19th century world founded on American Revolution, and how much on French Revolution?
They were connected, both by ideological inspiration and by political link.
France incurred huge costs of American Revolutionary War, which she could not get either England or America to repay, nor could afford to repay herself. This caused French Revolution, in which the French King and nobles paid with their heads for the freedom of Americans. The English King and nobles got to keep their heads.
So, what could be the worldwide effects of the following PoDs:
1) (The easiest and most plausible one). The French leadership sees reason in 1777 and realizes they cannot win - there is no plausible way they can get Britain to repay French war costs, because the British either accept a limited defeat as per OTL which still leaves French to pay their own war costs, or fight attrition war until the British are exhausted, and then the British cannot pay, so any victory is still a defeat. So they decline to support USA, USA fights a valiant struggle for a few more years but is defeated by attrition and Revolution suppressed. With France at peace and just the manageable French and Indian War debts, and also no inspiration from successful/surviving USA, French Revolution does not happen. What next?
2) France does enter ARW - but Britain still wins. France has war debts as per OTL, but there is no inspiration of successful/surviving USA. Does French Revolution still happen?