No, the Declaration of Independence absolutely did NOT include Charles Dalton's ancestors. The early United States did ban the importation of humans, but it was almost another 100 years before slavery was abolished. Owners maintained slave populations with laws saying that the child of a slave was also a slave.

It's a little weird to use the Declaration in an argument with a black man, and quite aggregious to describe anything as slavery, except actual slavery.

It's not just a conservative thing; liberals are also guilty. I know conservatives and liberals both who think taxes they don't like are a form of "slavery."