Define "bad"? You see brown people when you go outside?
Homeless people EVERWHERE doing the Fent lean, with no effective programs to fix the issues in sight. Ever increasing amounts of people that don't even speak the language, let alone participate in the culture. Don't forget the trash and filth everywhere, and boarded-up shops and housing.
I've been to multiple cities and suburbs on the west and east coast, in the midwest, and the south, and they all have these issues to varying degrees.
At a certain point, you have to ask yourself legitimately: What is the difference between walking outside in the US and some country like Afghanistan? The difference is becoming increasingly narrower.
Disorder, drug use and homelessness aren't problems caused by immigrants, documented or undocumented.
Immigrants (even the undocumented ones) pay more in taxes, receive fewer public benefits, commit less crime, are less likely to be homeless, and more likely to have a job than natives. The differences are small in most of these cases, but are more than enough to put down these meritless, racist tropes.
And across the spectrum, from low to high skill, documented to undocumented, on net, immigrants contribute positively to the economy and fuel growth
If you wanted to deliberately exacerbate all those social disorder issues you claim to care about a good place to start would be mass deportation
EDIT: I've also been all over the country. I've also been to quite a few legit third world countries. No where in American really compares, but closest you can probably get are usually rural and white (and also not very good at English) - like places throughout Appalachia.