Inequality between the working and middle classes has increased plenty in homogeneous nations like Japan as well.
U.S. median income ranks 6th in the world.
Crime is way down.
The U.S. is less corrupt than Japan, Korea, Ireland, France, or Taiwan.
The Rust Belt happened in the 80s when America was still pretty homogeneous, and the Midwest has actually recovered somewhat since.
Diverse cities like San Diego, NYC and Houston are the economic and cultural powerhouses of the nation.
Suicide rates are up, but only to the level of 1950 or 1970 (statista.com/statistics/187…)
Child poverty is at a record low thanks to the efficacy and increasing generosity of our government programs (cbpp.org/research/pover…)
Homelessness is down (bloomberg.com/view/articles/…)
Most countries got hit by the China Shock (voxeu.org/article/chines…) and everyone got hit by the Great Recession, but we're now recovering from both
Most of the facts, however, point to the opposite. America looked a lot more decline-y in the 1980s than now.
(end)