During the first six decades of the eighteenth century, the American colonies were mostly allowed to govern themselves. In exchange, they loyally fought for Great Britain in imperial wars against the French and Spanish. But in 1763, after the British and Americans won the French and Indian War, King George III began working to eliminate American self-government. The succeeding years saw a series of political crises provoked by the king and parliament. What turned the political dispute into a war was arms confiscation at Lexington and Concord, Massachusetts, on April 19, 1775.
https://theimaginativeconservative.org/2024/04/battles-lexington-concord-american-revolution-david-kopel.html