It will be white republicans vs. a blue government Mexicans, Negroes, liberals and whatever portion of the military does not defect. Republicans would win. Democrats have high numbers but their states are geographically isolated, the people are unfamiliar with effective firearm use and Dem policies have alienated large chunks of the military. To counter this they want to zerg with even more Mexicans through unchecked immigration and erode the 2nd amendment so the opposition population is disarmed.
What? It's funny, but, as it turns out, there are slightly more non-whites in the army than in the US population as a whole. And not every white is a Republican. Also, except perhaps in really lopsided zones (say, the DC, where there are barely any republicans, about 4% of the population, less than Asians), every state has at last a 30% share of every party, plus people who don't vote but will "take a side". Also "Mexicans" for hispanics and "Negroes" is a terminology that... yeah. Also a pretty idiotic stereotyping.
Social issues will fuel the fire but the actual ignition of conflict will be a massive economic crash. Apathy is too strong a deterrent when the system still works, we've seen in South Africa with whites that even if you're being murdered and have to drive to work in an armoured car you still have a job and a family to feed so people either flee or retreat to gated communities. No job and poverty = fight, especially since polarization is continuing further than what it was in 2008.
Well, the 2008 economic crash didn't cause any civil war. It's far more complex than it seems.
Does America need a revolution, civil war or large scale unrest? No, that will be terrible for the country, lots of people will die. What's needed is the cessation of globalization and importation of foreigners to drive down wages, as well as constant politically correct censorship and Marxist agenda pushing. That won't happen so I see civil war as inevitable.
Ignoring the Fox-News-stupid non-argument of "marxist agenda", I'll put it in a different way.
First of all, ending globalisation means that you are advocating for inflation. Because the upside of importing cheap products is... that you buy cheaper products! So consumers save money. If you have to buy inefficient US produce (because you can't make every good with 100% efficiency, sorry to tell you) instead, you'l be paying more for the same. And perhaps some people's wages would go up as they start selling more expensive goods by banning the competition- but the rest would see their purchasing power go down as they have to pay more for the same things. And that's not really very capitalistic.
Second, the real challenge is not just the "importation of foreigners". Foreigners won't "plummet wages" indefinitely as they need to earn a US living wage too in order to pay US prices now that they live in the US. They might be used to scraping by with lower salaries in their countries whre stuff is cheaper, but if you move to Illinois, I'm afraid you can't afford to ask for a "Mexican" salary, because you can't pay "Mexican" prices for food or clothing any more- you need to pay Illinois prices. Plus there are laws guaranteeing that every worker will make at least a certain amount of money per hour, so you can import as many foreigners you want, the salaries won't go any lower.
On top of it, salaries heavily depend on how you can compete too. I have two degrees in Journalism and I'm studying for a masters in Economics. I work writing analysis on the situation of American countries, like say, the near-collapse of the US shale oil industry or the current political upheaval in Brazil. If a wave of poor Romanians, Moroccans or Syrians comes here, I doubt any of them would be able to out-compete me on my field and drive my salary down. I have Mexican friends who speak impeccable English and have several degrees in engineering. If they move to the US, I doubt they'll be driving anybody's wages down- if anything, they'll be helping the US companies that are trying to recruit top talent to compete against other high-end companies.
And that goes on. If you are a qualified doctor, or scientist, or programmer, or lawyer, or actor -anything that requires knowledge, ability and qualification-, the chances of a random poor migrant coming in and outcompeting you through wages are close to zero. Who can be outcompeted? Minimum wage workers (whose wages can't go any lower anyway), or manual, routine-job blue-collar workers who are but cogs in a machine. You have two options, of course: either educating your workforce so they become something closer to engineers or creators, or taking the illiberal route of banning the importation of foreign labour. Will that fix everything? I'm afraid not, because the mid-20th century dream of a middle class of blue collar workers is nearing its end because of a simple reason: robots. If you artificially increase worker prices by banning competition, who is to say that the companies will not choose to buy machines instead, if they are cheaper over a long run? If deliverymen become too expensive to hire, a drone can do their job. If a cashier becomes too expensive, you can buy a check-out machine. If a worker in a car-making chain becomes too expensive, you can replace him with a robot and leave just two guys in maintenance. The real competition for routine, low-skill jobs is not foreigners, but robots.
And what happens if you ban immigration, ban robots and ban foreign imports of cheaper products? That consumer prices will shoot upwards, as you are essentially forcing companies to pay more for their workforce, which will be reflected in prices. And, of course, that will essentially destroy the ability of US exporters to compete abroad- that is, if any other country is ready to buy US produce after the US refused to buy anything produced abroad. In short, you'd be strangling the US economy with those steps. And the trust in US debt depends on the dollar being a commodity in itself. If the country chooses to isolate itself, the whole system will collapse, taking the entire economy along.
foreign intervention against a government seen as tyrannical.
In case you were wondering, I think that the only humans beings in the world who see the US Government as tyrannical are precisely a minor but fairly vocal part of the US population. If there was an uprising against the current, legitimate US Government, any foreign countries jumping in would do so to
defend it, not to fight it (except perhaps actual tyrannies like Russia or China).