This followed the election of 1866 when the pro-Union politicians lost power and pro-slavery Democrats replaced them.

Senators were hesitant about placing a pro-slavery Democrat on the Supreme Court.

T'Vault was a pro-slavery Democrat who became a member of the Provisional Legislature of Oregon in 1846.

In 1849 pro-slavery Democrats had Napton author a series of instructions for the state's representatives in Washington D.C.

These instructions came to be known as the "Jackson Resolutions", for Claiborne Fox Jackson an ardent pro-slavery Democrat who sponsored them in the Missouri Senate.

At this meeting, these pro-slavery Democrats concluded that if slavery were not expanded westward, conflict with the North and the secession of the South was inevitable.

As leader of the pro-slavery Democrats, he headed efforts to defeat powerful pro-Union Senator Thomas H. Benton.

Atchison, a pro-slavery Democrat, joined one of the Missouri militias and actually worked with the southern states prior to secession.

Douglas was neutral on slavery expansion, and came to be opposed by southern pro-slavery Democrats.

At the 1860 Democratic National Convention, the minority of pro-slavery Democrats blocked Douglas from getting the 2/3 majority required for nomination.