In the first instance, it is probably true that in general
the higher the education and intelligence of individuals becomes, the more
their views and tastes are differentiated and the less likely they are to agree
on a particular hierarchy of values. It is a corollary of this that if we wish
to find a high degree of uniformity and similarity of outlook, we have to
descend to the regions of lower moral and intellectual standards where the more
primitive and ‘common’ instincts and tastes prevail.
F. A. Hayek. The Road to Serfdom. London, 1944: page 102
There is a lot of talk that over the past decades we in the U.S. have become more polarized politically. For example, Kevin Drum makes that argument here, and Edward Luce does so here. And you can read through a whole lot more here.
I don't buy the argument that we're becoming more polarized; we've always been polarized. It's just now we disagree greatly along different margins and principles. For example, here is historian Richard Rehn discussing the election of 1800:
"While the Federalist press accused the Republicans of being 'filthy Jacobins' and 'monsters of sedition,' the Republican press denounced the Federalists for being 'Tory monarchists' and 'British-loving aristocrats' and the president for being 'a mock Monarch' who was 'blind, bald, toothless, querulous' and 'a ruffian deserving of the curses of mankind.' By the late 1790s both President John Adams and Vice-President Thomas Jefferson came to believe that they had become the victims, in Adams's words, of 'the most envious malignity, the most base, vulgar, sordid, fish-woman scurrility, and the most palpable lies' that had ever been leveled against any public official."
The issues over which they were discussing might seem a bit trite now, but the tone was as vitriolic then as we perceive our tone to be today. What's changed is that our preferences and ideals differ from that of 1800. So in a sense we perceive it as more vitriolic today, but I doubt it.
Our disagreements today might not enjoy as wide a consensus as in times past, but that's not because we're less willing to cooperate and compromise today relative to times past. What's happening is that today we have new preferences and ideals over which we are arguing, and as Hayek noted in the quote above, these differences today are of a higher order and are therefore likely to find less agreement.
After millennia of argument and debate, humankind came to agree a lot on the most basic of social laws that we accept as "natural" today — "[We] shall not steal," and "[We] shall not murder," we better appreciate and understand the importance of property rights. But that only occurred over time, and as we've further evolved socially, new issues arise and our wants and preferences further evolve. What they fought over in, say, 1800 is largely settled and we're now debating along different margins. The divergence of ideals and opinions today may seem greater than in times past, but those arguments back then were likely just as vicious. It's just that today we've come to accept the outcomes of those previous debates and are now debating new issues.
And this is such an important thing to keep in mind when discussing any social order. At no time did someone rationally construct the rules and institutions needed for a peaceful and prosperous social order. Such rules and institutions evolved over time and emerged out of vicious debate, much like what we in this country are experiencing today. The debates have high stakes, but maybe not so much today as in times past; I don't know. What we do know is that societies that choose well go on to secure largely peaceful and prosperous orders, while those that don't languish in poverty and strife and disorder. So far, those living in the developed world benefit from people in the past choosing well. People living in the latter never evolved to accept the basic rules and institutions to which those living in the developed and advancing countries already adhere and largely take for granted.