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Agreed, though " [...] showing the xenophobic parts of the world, that, yes, immigrants into one's country is a good thing!"

We actually don't need a colombian experiment to know this. It's all over the history books.

"if the best possible outcome happens, it will show all those xenophobes they were wrong".

Likewise, will you revise your viewpoints if the end result is less positive?

I wonder how easier it gets with populations of common roots. How different the languages and cultures ? the closer the easier.