If the colonies are defeated, the King would still be impressed by the Franklin's ability, and adopt him instead of hanging him, and let him spare his comrades. Then, to stop the bloody colonials for revolting again, His Majesty decide to cede the 13 colony for Franklin's own kingdom. Franklin would be forced to accept the American crown, and there was no US, the nation is "Kingdom of Benjamin Franklin"


(I heard he's a member of Royal Society of Science or somewhat)