National debt tops $22 trillion. $6 trillion of that is money thrown away in the Middle East and Afghanistan since 9/11/2001. Another few trillion is probably money thrown away by predatory “War on Drugs” law enforcement and imprisonment. Imagine how great we could be if we spent money on things that are actually useful to Americans instead on killing and jailing people.
America may or may not be in decline, but it falls short of its potential due to militarism, corruption, and authoritarian culture.