In 1770s people didn’t have self-government and people were angry. This means that they couldn’t make their own laws. And they had to pay taxes for the king. Colonists couldn’t move to west of the Appalachians. And there are many more reasons why colonist were angry at British (state) I just can’t tell it all because I don’t remember the other ones. But here are the main reasons. Hope this helps you ^^
