Why did the American Revolution first break out in the British colonies in North America and not in the South American colonies?

The immigrants to North America mainly come from Europe, and there are very few Indians. These immigrants to the New World are all Protestants and dissidents, that is, people who politically demand peace. These politicians had the political power of the time. The most advanced political concepts, the largest number of them are British immigrants, followed by the Germans who like to serve as soldiers. This is also the guarantee of the combat effectiveness of North America. Besides, in South America, small countries such as Spain and Portugal are mainly tossing, and they colonize. The Indians were slaves, and politics and everything else were enslaved, and there was no foresight.