You might want to consider World-Systems Theory as a good starting point. Workers in the imperial core do not experience the same kind of exploitation as people in the periphery. The USA is a high-income country.
And nothing lasts forever. Nothing is necessarily so. We are in the midst of a massive global paradigm shift. Multipolarity is on the rise. Things are changing everywhere fast.
Settlers by J Sakai is a brilliant expose of American settler-colonial culture and vital history book that attempts to answer this question, but if you decide to give it a read, I would advise you not to draw too many hard and fast conclusions about its contents. Discussions about this book get explosive because they touch on very sensitive racial tensions, and a lot of people get very ridiculous about the whole thing.
Read Settlers by J Sakai, the entire book addresses this one question for white USians.
Also, zak cope, especially divided world divided class.
You can find audiobooks for both of these on youtube and torrents.
Do you know where can I get it for free?
Your local library most likely, it’s a fairly common book.
If you meant online, there are free pdfs available.
https://readsettlers.org/settlers.pdf
Here is an HTML version with a clickable table of contents.
I highly doubt most local libraries carry a copy of Settlers. Where are you seeing this?
At home in Belarus, and my time traveling and living in the Northeast and West Coast of the United States. I spend a lot of time in the political science part of libraries and I see it pretty commonly. Maybe not all small local libraries will carry it, but starting from a medium sized library, to large ones, its pretty common.
I have also never not seen Settlers in a university library, which are open to the public where I have been.