The worlds population has been on the move since the end of WW II.  Mass migration from war, poverty & political & religious persecution is unprecedented in world history.  I read somewhere where its been estimated to be in the 60 million + range since then.

Being an immigrant myself it's totally understandable.  People vote with their feet, when the ballot box doesn't work or the system is corrupt.  That's why my parents got out of Sicily and landed on these fair shores.  My father just got frustrated with trying to get ahead and having to bribe multiple officials to expand his farm.  We weren't starving by any stretch and reasonably well off.  After the war, thru sheer will power and back-breaking work, along with his brothers, they amassed quite a bit of land.  But the built-in economic/political caste system basically told them, OK, moving forward you'll have to pay to expand further.

At that point, he said fuck it and pulled up stakes.  While America has it own share of corruption, a man/woman can still get ahead much farther here than most countries in the world.  You have the 'opportunity' here not afforded anywhere else.

I doubt Europe is dying from my conversations with relatives still in the old sod.  While there was some initial racism when the Arabs/Africans started showing up in the early 2000's, the attitudes toward these immigrants has changed.  Being an island that's been repeatedly invaded & plundered and being of mixed races themselves, they can see why this is happening.  And they've also been a boon to the farming/service economies; they work for less and commit less crimes than the locals, for fear of being deported.