It doesn’t matter if it was wrong. That is what they thought. that was in fact their assumption. And the wrote it down for us to read it.
So stop propagating lies.
Stop it.
Well the guy you quoted certainly did. How many of him were at the signing of the Declaration then?
Someone posted earlier that there were 56 of them, so him and Jefferson make two, and that leaves 54 that we don't know about.
Presumably as they all came from slave owning states, they likely didn't want to wade into that issue while they were trying to justify their own independence from England.