As far as I'm aware, The French Revolution was started by the French, not by George Washington, who was and had been the only US President at the time of the French Revolution.
Unless the Americans have built a time machine.
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Because we were a new country and we did not want to interfere. Also, our policy on foreign affairs at the time was neutral.
The US owded France money for providing weapons supplies and ships in the American Revolution. Their help came at a price which Massachutsets attempted to pay.
The French Revolution had no direct effect on the United States. A new country, the US had sufficient teething problems organizing and financing their new democracy, and the turmoil in France had no effect. However, after the Revolution, when Napoleon returned to power and fought the English, it gave Jefferson's reconstituted US Navy the opportunity to support the US Marines in the early fight against the Barbary pirates in the Mediteranian.
Because people outside of France, take the United States for example, wanted French to have the same freedoms that the Unted States has and they helped us in the American Revolution and some people believed we should return the favor.
The French did support the Americans some what in the war, however, only on a colonial point of view, with 13,500 French colonists joining the American Ranks and vast numbers of weapons and supplies being given to the miltia. French and British colonies were at war but not France and Britain themselves as the British had all but destroyed the French Fleet in the Seven Year War, the only thing that could stop the British from invading France itself would be a fleet, and since there wasn't a fleet that could stand up to the British Navy anymore a European War would have been foolish.