In many parts of the world, population has skyrocketed in past years. There is a strong correlation between the existing level of development in a country and a country's population growth rate. As countries become more developed, birth rates tend to decline, whereas countries that remain relatively underdeveloped retain higher birth rates. As countries become more developed, their set amount of resources naturally present becomes capable of supporting a greater number of people, whereas in undeveloped countries the amount of resources naturally present is capable of supporting a much lesser number of people.
Ironically, those countries with the highest capacity to accommodate new people tend to have the lowest birthrates, and that those regions with the lowest capacity to accommodate new people tend to have the highest birthrates.
In the past, discrepancies between population growth resource distribution have led people to migrate en masse. A prime example of this is European immigration to the United States in the 1800's and 1900's. The population of Europe had exceeded the resources available in the region, and declining standards of living caused people to cast their eyes elsewhere. Relatively open immigration policies and a surplus of resources relative to the existing population made the United States a popular destination for immigrants. Allowing immigrants to flow from areas of low resources to areas of high resources led to positive economic results for both the host nation and the donor nation. Immigration can simultaneously provide solutions to two problems: a host nation's large proportion of underdeveloped resources in proportion to its existing population, and a donor nation's low proportion of resources in proportion to its existing population.
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