The secondary topic of this thread seems to be about Americans coming together now realistically I don't think you can expect Americans to come together anytime soon and this link sort of sums up why though I can't quote all of it cause it's long:
I started this essay by pointing out that, despite what geographical and cultural distance would suggest, the Nazis’ outgroup was not the vastly different Japanese, but the almost-identical German Jews.
And my hypothesis, stated plainly, is that if you’re part of the Blue Tribe, then your outgroup isn’t al-Qaeda, or Muslims, or blacks, or gays, or transpeople, or Jews, or atheists – it’s the Red Tribe.
Every election cycle like clockwork, conservatives accuse liberals of not being sufficiently pro-America. And every election cycle like clockwork, liberals give extremely unconvincing denials of this.
Well, in the same way “going to synagogue” is merely the iceberg-tip of a Jewish tribe with many distinguishing characteristics, so “voting Republican” or “identifying as conservative” or “believing in creationism” is the iceberg-tip of a conservative tribe with many distinguishing characteristics.
A disproportionate number of my friends are Jewish, because I meet them at psychiatry conferences or something – we self-segregate not based on explicit religion but on implicit tribal characteristics. So in the same way, political tribes self-segregate to an impressive extent – a 1/10^45 extent, I will never tire of hammering in – based on their implicit tribal characteristics.
The people who are actually into this sort of thing sketch out a bunch of speculative tribes and subtribes, but to make it easier, let me stick with two and a half.
The Red Tribe is most classically typified by conservative political beliefs, strong evangelical religious beliefs, creationism, opposing gay marriage, owning guns, eating steak, drinking Coca-Cola, driving SUVs, watching lots of TV, enjoying American football, getting conspicuously upset about terrorists and commies, marrying early, divorcing early, shouting “USA IS NUMBER ONE!!!”, and listening to country music.
The Blue Tribe is most classically typified by liberal political beliefs, vague agnosticism, supporting gay rights, thinking guns are barbaric, eating arugula, drinking fancy bottled water, driving Priuses, reading lots of books, being highly educated, mocking American football, feeling vaguely like they should like soccer but never really being able to get into it, getting conspicuously upset about sexists and bigots, marrying later, constantly pointing out how much more civilized European countries are than America, and listening to “everything except country”.
(There is a partly-formed attempt to spin off a Grey Tribe typified by libertarian political beliefs, Dawkins-style atheism, vague annoyance that the question of gay rights even comes up, eating paleo, drinking Soylent, calling in rides on Uber, reading lots of blogs, calling American football “sportsball”, getting conspicuously upset about the War on Drugs and the NSA, and listening to filk – but for our current purposes this is a distraction and they can safely be considered part of the Blue Tribe most of the time)
I think these “tribes” will turn out to be even stronger categories than politics. Harvard might skew 80-20 in terms of Democrats vs. Republicans, 90-10 in terms of liberals vs. conservatives, but maybe 99-1 in terms of Blues vs. Reds.
My hunch – both the Red Tribe and the Blue Tribe, for whatever reason, identify “America” with the Red Tribe. Ask people for typically “American” things, and you end up with a very Red list of characteristics – guns, religion, barbecues, American football, NASCAR, cowboys, SUVs, unrestrained capitalism.
That means the Red Tribe feels intensely patriotic about “their” country, and the Blue Tribe feels like they’re living in fortified enclaves deep in hostile territory.
We then noted that although liberals and conservatives live in the same area, they might as well be two totally different countries or universe as far as level of interaction were concerned.
Contra the usual idea of them being marked only by voting behavior, we described them as very different tribes with totally different cultures. You can speak of “American culture” only in the same way you can speak of “Asian culture” – that is, with a lot of interior boundaries being pushed under the rug.
The outgroup of the Red Tribe is occasionally blacks and gays and Muslims, more often the Blue Tribe.
The Blue Tribe has performed some kind of very impressive act of alchemy, and transmuted all of its outgroup hatred to the Red Tribe.
Now this has been going on a long while, but it's been getting increasingly aggressive lately. Though something similar happens in many places - it's particularly hard for the US to form a cohesive unified culture because of it's history imo.