Then why didn't they make their own individual Declarations?
Why did the British name each of the colonies in the Treaty? To differentiate them for their other American processions such as Canada and the West Indies that were not part of the United States. You will note that after the war, the British only sent one ambassador to the US... not thirteen. We only sent one to London, not thirteen.
You know better than to try common sense with the neo-rebs.
Walt