Answer:
Step-by-step explanation:
They didn't want to be under British rule because they were forced to one religion and they wanted to not be in bondage. Also, king Geroge III was a bad king and they didn't like him or how the government was being run (you can see this in the Petition to the king, as they literally bashed the king on all the stuff he was doing wrong)
So to sum it up. They wanted freedom, being under King Geroge III rule was not allowing them to have that freedom. So they came to America to start up a new government.
Hope this helps! ;)