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this post was submitted on 15 Aug 2023
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Size mainly, they are huge countries with lots of cheap land and a historically (and deliberately) high immigration rate.
If you compare population density with those countries and European countries, you will notice that the US and Brazil density is still much lower than almost all European countries (especially their former colonisers), and the US, which is roughly the same size as Europe and Brazil which is 4/5 of Europe, still has less than half the population and a third the population of Europe respectively.
Also, progress in medicine and transportation means longer lives and ease of, well, just leave a crowded area and go somewhere else.