It wouldn’t have. The American Revolution inspired revolutions in 60 other countries, including the French, Haitian and Mexican revolutions, and it’s what helped kickstart modern-day democracy in much of the world for that fact. Had the U.S. lost, it would have forever cemented the idea that the crown is all-powerful, beyond reproach, and the only way to get anything in life is to kiss the ring.
No matter how evil the U.S. turned out to be, the way it began will always be its true importance imo.