Oh don't think for one second that they actually want a civil war. A civil war is fought by sides that have fundamental differences in how they want the government to function. Conservatives don't really have any idea how or if they want the government to function. Because if you sit a bunch of conservatives down in a conference room and talk them through their ideal government, writing it all down and asking questions like, "but what if the president is corrupt?" Or "how do we ensure safe, clean drinking water?" they'd wind up basically with what we have now (but maybe with states having more power but maybe even less).

When conservatives barf up words like, "civil war" it's really just a dog whistle. What they really want is an excuse to commit mass murder of black people, immigrants, LGBTQ, etc (all the people they hate and blame for all the problems they create or refuse to fix).

Here's how it would play out: A consensus forms in the conservative crazysphere that civil war is a must then some event happens and the talking heads will declare, "it's a civil war!" and then the crazies with guns will congregate go on a killing spree.

If law enforcement stops them it will end, briefly before it happens again. If law enforcement helps them it'll be a real civil war. That's when things will become real bad for Americans. Severe economic consequences; the dollar will tank. Food and supply shortages will create a lot of desperate people.

Foreign governments will probably straight up invade and claim territories under the excuse of "keeping things stable" (for their own economies).

Billionaires will just move to other countries but they'll lose probably 90% of their wealth. If they're caught undefended out in the open they probably won't make it. Their assets would be siezed by any territories claimed by democratic (aka "liberal") groups in order to fund the war. Mere millionaires will find their wealth disappear overnight. They'll probably try to pass themselves off as middle class for as long as they can… Moving in with family, forced to abandon their mansions.

The rich that sided with the liberals (e.g. celebrities that are easily identified as liberal) will fair the best amongst the wealthy in democratic strongholds.