[Regarding "What still unites us?"] The statue issues is just a blip on the cultural radar.
Don't forget the conservatives got upset with what they considered obscene publicly funded art and demanded it be removed. The public art issues has came full circle.
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But to your point on common ground:
We are witnessing a massive sea change (at blinding speed) of technology, science and medicine – the likes of which we've never seen.
The next 20 years will be nothing short of amazing and terrifying. The old American vanguards, coalitions and politics will either adapt or perish. It will be new America – maybe not in the geographical or physical sense as we know it today, but one that will have all our hallmarks of being just, caring and exceptional.
Fran The Man