The republicans had changed from a party of moral reform to a party of material interest
Massive class inequality. Nobles and Clergymen were, in the French citizen's eyes, wasting money to fuel their lavish life style. They believed the 1% were living off the other 99% and they were right. France had a huge economic downfall after supporting the American Revolution so the citizens thought it unfair that the problem the government caused should be forced on them alone.
The South won every major Civil War battle until the Battle of Antietam.