Birth rate
The region of Sub-Saharan Africa has the highest birth rate in the world. As of 2016, Niger, Mali, Uganda, Zambia, and Burundi have the highest birth rates in the world. This is part of the fertility-income paradox, as these countries are very poor, and it may seem counter-intuitive for families there to have so many children. The inverse relationship between income and fertility has been termed a "demographic-economic "paradox"" by the notion that greater means would enable the production of more offspring as suggested by the influential Thomas Malthus.
Foreign born
The percentage of foreign born in a country is the product mostly of immigration rates, but is also affected by emigration rates and birth and death rates in the destination country. For example, the United Kingdom and Ireland are destination countries for migrants from Eastern Europe, Africa, and Asia, but are themselves source countries for immigration to other English-speaking countries. The countries with the highest rates of immigration are wealthy countries with relatively open nationality or migration laws, including the United States, Canada, the United Kingdom, Australia, and the Persian Gulf states.