I suppose it is, to an extent, a demonstration of what a disparate, polyglot is the USA. We look upon the UK as a pretty mixed society nowadays, but I often think that the USA must be the most 'mixed' nation on earth. Not just mixed in terms of race, but look at the sheer size of the place, and the enormous influxes of nationalities it has accommodated. And then there is its relatively recent history - the war between the states still reverberates in some places and in some echelons of society. OK, it ended 155 years ago, but the ramifications went on for many years after 1865. There is also the factor of 'states rights' - something quite alien to most of folk in the UK (nationalist groups apart).
I could go on, but I can sense the eyes glazing over - what it boils down to is that trying to understand America as though it somehow a Britain writ large with a few tweaks - after all we speak the same language (well, most of us do) - is totally wrong, It is very, very different. Folk here who can't understand why Trump has such a following are making the mistake that, again, American politics is similar to our own - it isn't.
MIke