Poland even without immigrants is already backwards country. Poles being poles and Poland being an ethnostate is more than enough to bring Poland to the state of degeneracy it is in now. After Jewish population left this backwards and rotting "country" and after purges of native intelligentsia, now all that's left is what Trotsky called "white negroes", his dream has been accomplished, not in Russia, but Poland.

All you need to know about Poland and poles, here in polish guy's own words:

https://lyricstranslate.com/en/my-polacy-thats-us-poles.html

https://www.youtube.com/watch?v=XcQdJyo1B-8

Here is just a little taste for you:

"Not many like us, most hate us
All are afraid of us, especially the Jews
The Pole will rob you, The Pole will get you
The Pole won't let go, only the Russians are worse
Here we have a Mexico that you never even dreamed of
Believe it's the third world here but I like my trash"

"There is no order, no composition
Even no trace of this.
There is chaos here, so you better sharpen your teeth
If you do not want to go down (you go down)
Poland for the Poles, for scams and bastards."

"This is my burrow, I am a Pole and I've got a baseball bat,
Just in case something doesn't suit me.
Hey, we don't want any pedophiles or gays where we live
It bothers me, better run away.
In my hatred also atheists, satanists
You can die in the Gulag camp"

"Fists up, we will always make it,
If not with the law, I'll take the left side.
There's also a war, who is cheating is doing well
I buy for less and sell for more, to be able to drink vodka.
Because we swigg a lot, after all drinking is not a sin
There's vodka, small strong Polish beer "Lech", too!"

Poland is currently populated by degenerates and situation will only get worse, mostly because of their gene-pool.