A main difference is the context of the war. The American Revolution was caused by a majority of the America population becoming unhappy because of how the British were ruling them. The French Revolution started between the French lower class and the French government.
American revolution was caused due to the unfair and unsatisfactory ruling of the British towards American colonies.
French revolution was caused because of the discrimination between higher class ( nobles, priests ) and lower class ( common people like doctors and workers ) . The lower class were heavily taxed and those who couldn't afford were mostly sent to the Prison of Bastille while the officials led a lavish and luxurious life style .
