Five reason the colonists separated from britain

1. Too many taxes
2. No representation in Parliament
3. Trade was only allowed with Britian
4. They were left alone for so long, then Britian came back, like a parent coming back to your house after you've lived alone for so long, and you can't get rid of them.
5. They weren't being treated equally

If you want anything else, I may suggest searching it up.