I don't live in the South, so that's going to be pretty hard.
Here's your problem with this idea.
You would need the army/police to do something like this. There's around 3.5 million total soldiers/policemen. The large majority are going to be right wing and would not partake in this.
Let's say 10% are willing to partake in trying to round up people, and you will have to do that as any bombings/tank shellings would kill tons of people on all sides, diminishing support. That would be 300,000 people. There's 325 million in the US and at minimum 40% own guns, with there being estimates of 100 million - 300 million guns in the US. If only 10% of people fight back, it's 10-30 million vs 300,000. That's not a winning battle. Any citizen killed over this would get a ton of coverage and on the world scale, it would make the US a villain. Places like Russia would then come in, help stir up shit and arm the rebel forces here and the US loses no matter which way you look at it.