The 'slave power' included the north, pagan. As a matter of fact, if it wasn't for the yankee slave traders there wouldn't have been any slaves in the South.
The problem with you neo-yanks is that you've been completely brainwashed by the False Cause propaganda machine, i.e., the federal government that you worship.
The war was begun by the Slave Power, to give Virginia the excuse they needed for their pretended secession. Begun by the Slave Power, for the higher cause of Slavery.
Mythology and lies; the neo-yankee stock in trade.
Oddly, northern states didn’t rebel.
That shows your assertion that the north was part of the Slave Power is false.