The poorest state in America, Mississippi, is richer than most of the world [1][2]. (No. 19, between the U.K. and New Zealand.) The post-war era experienced the largest and most broad-based increase in material prosperity in human history. Our poorest Americans saw real economic gains rivaling multi-generational ones for Rome's richest. If there is something that will kill us, it's ahistorical nihilism.
[1] https://en.wikipedia.org/wiki/List_of_U.S._states_and_territ...
[2] https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(nomi...