Note that some of the entries here are clearly outdated. I've cycled through some "global south" countries that I'm familiar with and what's shown may have been true maybe 15-20 years ago. GDP has 4x since then and at the same salary level the lifestyle is either equivalent or better than the richer countries.
I observed the same. There are "poor" countries listed here that would make large swaths of Americans look like they still lived pre-WWII, and were destitute.
Edit: Sorry, to be more explicit: by global standards large swaths of Americans DO live pre-WWII lives and have poorly constructed homes and lifestyles.