The new world (North and South America) were both founded by immigrants and as such, despite the issues that flare up now and again, have an innate sense of how to deal with waves of immigration.
The old world of Europe is not able to handle this as well. In fact there is a longer and more virulent history of state sponsored racism, despite strong liberal counter streams, in Europe than in North and South America. The right wing political regimes of the 30s did not rise in a vacuum and they did not disappear after WWII. These movements have grown in power as increasing numbers of immigrants have swelled the stagnating populations of many European nations (politicians know they need to immigrant populations to grow their economies as their indigenous population's birth rates continue to slide).
This kind of attitude is not just a product of Europe and its offspring nations. It can also be seen in Asia. There is a nasty xenophobic streak running through the heart of Japan and Korea. You can also see issues of immigrants and migrant workers combined with a declining indigenous birth rate in Singapore as well. It's one of the big topics in the news these days.
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"My hands are on fire. Hands are on fire. Ain't got no more time for all you charlatans and liars."
- Old Man Luedecke
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