Not all democrats owned slaves , but all slave owners were democrats.
“Not all democrats owned slaves , but all slave owners were democrats.”
George Washington, perhaps the largest slaveowner of his time, was not a Democrat. If anything he was a Federalist but he never joined any party.
Thomas Jefferson belonged to what was called the Republican Party in his time. Today it’s called the Democratic-Republican Party. Jefferson, Madison and Monroe, slaveowners, belonged to it. It split into the Democratic Party and the National Republican Party in 1824.
The Whigs were a precursor party of the modern Republicans. There were four Whig Presidents, Harrison, Tyler, Taylor and Fillmore. William Henry Harrison had owned slaves before he was President. Tyler owned slaves. Taylor owned slaves. Fillmore didn’t.
Actually, one of the richest slave owners was black.
My great-great grandfather fought in the Civil War as a Confederate. He didn’t own slaves, was just a hard-working white man, fought at Shiloh as the most prominent battle we know about in our family. - We did have some relatives further back who owned slaves down in Georgia Indian Territory. One of their sons married a Cherokee woman; which about caused my ggggggg-grandmother to have a conniption fit. So, our gggggg-grandfather gave the kids their inheritance in gold & they boarded a boat & came to Tennessee. That’s how we got to Tennessee.
Actually thousands of slave owners couldn't vote. They were black.