Concentrated poverty in the US is actually quite bad. Combine it with racial disparities, and you def get third world conditions. Even without taking class into account, Black American life expectancy is worse than say the life expectancy of Algeria, Dominican Republic and Sri Lanka. If you look at somewhere like, say, being poor, black, and male in Detroit, you see life expectancies in the mid 50s, which is pretty much scraping the bottom of most of the poorest countries. It is a combination of much higher infant mortality, much higher violent crime victimization rates, and much worse health coverage among other things.
People need to stop saying things like "The US has mobile phones, so it isn't poor". Hell, mobile phone penetration into much of Africa is extraordinarily high, it is one of the primary ways of sending and receiving payments for example, but you can't eat a mobile phone (or sell it and buy much food either).
Poverty has little to do with having a phone (or even a TV) and much to do with access to structures of opportunity -- educational and employment for sure, but also the ability to live in a safe environment, the ability to access culturally competent health care. I think people from social democracies in Europe don't realize #1) how little of a social safety net the US has and #2) how many people we incarcerate in the US. Essentially if you are a poor man in the US, you stand a decent chance of spending time in prison.
I lived and worked in one of the most violent zipcodes in the US for quite a few years as a social worker. Absolute and relative poverty is quite dismal in parts of the US. It is another world, if you've never spent time in it and your only point of reference is that people can "afford" cellphones and cigarettes then you really don't know what you are talking about, sorry. (Hell, 200 years ago even the richest of people shit in outhouses or chamberpots, but that didn't make them less rich and powerful)
I support a guaranteed basic income (non means tested, everyone gets it) in both in-kind and cash benefits. And I think we are far rich enough as a society to make it worth it and the general happiness and productivity gains will more than offset any freeloading drag.