Too weak central gov<span />
The Declaration summarized the colonists’ motivations for seeking independence. By declaring themselves an independent nation, the American colonists were able to confirm an official alliance with the Government of France and obtain French assistance in the war against Great Britain. So basically so it could be official
Robot machines that do factory work a lot faster and nicer than humans
Some thought war was too drastic. They thought "wait a second, let's not do something crazy here. Let's just try to work with Britain to get our rights back, instead of overthrowing the whole thing and establishing our own thing. That's just too much." Some thought that we would lose the revolution (which, in all honesty, they had good reason to think that) and didn't want to upset Britain.
