What does this mean blows must decide whether they are to be subject to this country or independent?

King George III suspected New England gov. was in the state of rebelling. If they have more violence, they have remember they are people of Britain or else, they will be leave alone and cut all ties from their original country.

note-The whole sentence suppose to be like this," The New England governments are in a state of rebellion, "...blows must decide whether they are to be subject to this country or independent.' "