Why do countries allow so much immigration?

countries nowadays allow way too much immigration into the country. This will be a bad thing in the long run because the country will end up losing its original culture and heritage when the population of immigrants gets big enough the countries original culture and heritage will be replaced with the culture of the... show more countries nowadays allow way too much immigration into the country. This will be a bad thing in the long run because the country will end up losing its original culture and heritage when the population of immigrants gets big enough the countries original culture and heritage will be replaced with the culture of the immigrants.
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