Because of unfair taxes and illegal laws by Britishers made Americans to fight for their independence.
Explanation:
British monarchy where establish their colonies in the American soil and they stated controlling them. But American was of the opinion that they want their own government to take control of finance and laws.
British controlled colonies have started putting unfair taxes to clear their war debt. This irked the Americans and they started the revolt.
This revolt against the British colonies started the independent movement throughout America and at last thrown out the British monarchy from power.
