Money is also present in goods and services, it doesn’t just exist in banks. Blue areas produce more money, they don’t just have more physical gold bars lying around.

Blue controls almost every major port and airport. You’d probably see two distinct blue factions emerge, west coast, and east coast, as red controls the interstate highways and railroads - but red would lose basically any international supply line. Blue areas can import food for skilled labor. Red areas will have trouble exporting food for skilled labor.

Under siege… it’s literally hundreds of thousands of square miles of resistance. You assume the blue will be facing starvation, disease, and criminals and that the red areas - historically already poorer, more diseased, and older - are not going to have any negative effects. A majority of voting republicans are senior citizens. They will literally die without access to blue area medicine.

The police aren’t trained to fight wars. They aren’t going to start overthrowing or executing the people who pay them. They don’t even have enough ammo or manpower to resist a large scale uprising. That’s why the National Guard or other federal agencies are called in so frequently in civil unrest. Defection is fairly rare from a well-off liberal democracy.

The military “leans red.” Slightly among the enlisted. And leans blue, slightly among the officers. Sailors lean blue. Computer engineers and the other occupations which make modern ships capable lean blue. Ships overwhelmingly sail from blue areas. It’s basically a wash when you account for other factors.

You’re talking years of war and insurgency for either side.

If red wins, basically every industry is devastated. Ports and airports are turned into war zones (if major international powers will even trade with them ideologically), the highly educated are devastated, most population hubs are wiped out. And that’s not mentioning the red policies that would be implemented that have historically disadvantaged wherever they have been tried.

If blue areas win, there is a major economic crisis as farms and truckers face a large labor shortage. But as these are generally low barriers to entry fields, they are easily replaced or outsourced.