It wasn't me who compared the USA to China, Mexico, and Russia, countries with massive social problems, including poverty like you have never seen or experienced.
I wanted to give the USA the benefit of the doubt and compare them to countries with very similar demographics, diversity, and physical characteristics. You decided that was too much to aspire to, and that the USA should be content because it's better then China, Mexico, and Russia. Use whatever terms you want to describe it, but I think you could aim higher.
You talk about diversity, Canada and many parts of Europe are just as diverse as the US, the difference lies in less of an "us vs them" mentality (there are no "african-canadians" "italian-canadians" etc, they're all just Canadian)
You talk about large geography. Canada and Australia both have that covered.
You talk about urban density. Europe has you beat.
You talk about rural areas. Canada and Australia have you beat.
You talk about illegal immigrants from poor nations adjacent. Australia has a huge problem here with boatloads of people trying to sneak in from nearby Asian countries, Much of europe shares borders with countries rife with poverty.
You're making excuses because you don't want to fix your mess.