How did the schism open up over the race vs. class divide?
It was the class side siding more with Trump than Hillary on economics, whether they wanted to admit it or not. Since Trump won, the class-oriented Dems can say "I toldja so" about the impotence of identity politics, and the importance of class. When the race baiters snap back about the class Dems being crypto-Trump supporters, both sides have exchanged fire.
Because they're a crumbling empire rather than an inchoate insurgency, there's a positive feedback loop between the two warring factions, which will split them farther and farther apart.
How could this be re-created over gender identity politics vs. class?
See this earlier post about the common ground that the populist nationalist movement shares with the Jill Stein and Bernie crowd regarding family formation. The old GOP framed family formation in natalist terms, where having children is a moral good per se and ought to be pursued to make the world a more moral and good place.
The populist take, from the Jill and Bernie people, is materialist -- forming a family is one of those normal things that normal people do, so if a majority are not, then either a majority are abnormal or there are other obstacles in their path. These are shaky income prospects and shifting residence patterns for fertile-aged women and their husbands, as they hunt for good-paying stable jobs in what feels like a wild goose chase.
In this video (at 7:15), Emma Vigeland from The Young Turks: Politics discusses this topic with her interview subject, a working-class black woman from suburban Cleveland. Vigeland takes it for granted that getting married and starting a family is a desirable thing, but feels financially uncertain and therefore hesitant to get started right away in her early 20s. She's clearly from an affluent family herself, so it hits on the theme of downward class mobility. Gen X-ers and Millennials may not want to admit it, but delaying marriage and having small or no families is yet another sign of their downward mobility.
The old GOP stance was the extremist conclusion -- that more and more young people are abnormal, as shown by their lack of interest in forming a family. This personalized and moralized their childlessness, as though it were a deliberate statement or a decision, rather than a situation they'd rather not find themselves in.
Trump, with Ivanka's help, is making this issue a materialist one again, seeking to make childcare more affordable so that young people can do what they want to do, which is get married and start having children. It's just one of those normal things everyone wants to get around to doing, not some higher good.
There is a waiting schism among Democrat women between those who are anti-natalists -- morally indignant at the idea of family formation being a good thing -- and normal women who want to start a family when they're able to afford it. We can help to ignite the war between them like we have with the race vs. class war.
The more the Trump movement discusses -- in a neutral, non-moralistic tone -- family formation as something that most normal people want to get around to, and are only putting it off because they're in an uncertain economic situation, the more we will force Democrat women to reveal which side they're on, and then go to war against each other.
The class-oriented ones will say, "Y'know, I hate to admit that Trump is right about anything, but he has a point." That will provoke the feminists into denouncing the normal ones for "judging" women who don't want a husband and/or children. The response by normals: "No, we don't mean those women are, like, morally bad or anything -- but shrinking family formation is a bad sign of economic stagnation." Oh, so you're one of those "economics is everything" women who doesn't care if she gets turned into a baby factory by her husband? "Excuse me? 'Gets turned into?' What if I want the children myself?" You see! -- she admits to internalizing patriarchal norms!
The end result is the SJWs waging a crusade to shame their fellow Democrats for having normal priorities, whether it's wanting to bring back good-paying jobs or make family formation affordable for all people and not just the rich. Normal people will resent being shamed for having normal priorities, which causes the SJWs to splinter off from the coalition, into their own purity cult, all hermetic and misanthropic.
It wasn't too long ago that Republican activists tried to shame Democrats and Independents as abnormal for not wanting to live under a Christian Zionist theocracy. Now the shoe is on the other foot, with Democrats becoming the party of alienating cultural extremists.
Hopefully Trump and Ivanka will start bringing up the topic again, but why wait? We can start sowing the seeds of discord with memes directed at normal women, from feminazi women. It's hardly a false flag when this is truly what they already believe, in substance and in tone. Put something like this over a picture of Elena Kagan looking maximally smug.
Dear faux-feminist women:
Starting a family is one of your life goals?
Seriously, baby factory much?
Your internalized misogyny is disgusting.
And, btw, makes you look weak and pathetic.
The real independent women