There wasn't really unequal representation since every white Southern male vote was counted as 1 vote.
Slaves were property and property can't vote but the Southern states wanted to make their property vote and have more power from that. Sounds very opportunistic to me.
In Marion County Florida it’s a part of a historical display. The residents of the state of Florida have lived under five flags five sovereign banners Spain, France, Great Britain, the Confederacy, and the United States. These are known as the “5 Flags of Florida” and have flown without incident for many years.
http://www.ocalapost.com/confederate-flag-southern-heritage-rally-attracts-thousands/