>The reason the US does nothing about climate change, privacy, inequality, etc. is lack of homogeneity

I don't agree with the general point, but I do think the GOP funding class uses the US's heterogeneity as a wedge to distract from those issues (or anything else that would cost them money). See all of the culture wars.

What's the one big thing congress passed during the Trump years? The tax cut. That's not a mistake.