Perhaps you can point out where it says the Democratics had nothing to do with slavery and opposed it.
https://en.wikipedia.org/wiki/History_of_the_United_States_Democratic_Party
The Democratic Party is the oldest voter-based political party in the world and the oldest existing political party in the United States, tracing its heritage back to the anti-Federalists and the Jeffersonian Democratic-Republican Party of the 1790s.[1][2][3] Known as the party of the "common man", the early Democratic Party stood for individual rights, state sovereignty, and opposed banks and the abolition of slavery.