That is the misconception.
Almost anyone in the most developped countries has it much better than anyone before the industrial revolution.
I will now use the examples from the social democratic contries rather than US as healthcare is a mess in US, but most of this applies to US too, as even in US the poor still get more than back then.
First that Healthcare:
-Child mortality back then was more than 30% now way below 1% due to things like vaaccinations, antiobiotics, sanitaion and healthcare in general. Even rich people back then had super high child mortality even if maybe a bit lower than average.
-Vaccinations and diseases in general: Since then we have gained almost universal coverage of the vaccinations against the deadliest diseases. so mortality to such has crashed. Back then, people just died of such, regardless of social class or how rich you are.
-Anyone in need of healthcare will get, while not neccessary the best in the world, 100 times better healthcare than even the Kings back then.
Then knowledge:
-The poorest of kids will get an education, that while likely has less classic litterature and religion than back then, is in other ways superior.
-Each one of us has at our fingertips available more information and quicker than even the richest back then could dream off.
Travel and communications:
-Want to visit family in other side of the country: Today, train ticket: cost 1-4 hours of work in the lowest paying jobs and few hours. Back then a long and arduous trip taking days.
-Want to communicate with them: today: just video call them, back then: maybe the national mail existed already or maybe not, in any case paper was expensive and writing with an ink pen slow.
And so on..
I would 100% rather be in the lowest 10% in any of the Social democratic coutries today than in the top 0.1% back in say 1700.