This video will explain why the nurseries, kindergartens, and schools of the affluent world are becoming a bit under-populated.
In Europe you may find most nursery cribs occupied by children of third world immigrants. This wave of immigrant children will pass through the schools, and into the prison population almost before you know it. So even though crime rates in Europe are bound to soar -- relatively speaking -- the social welfare programs and skilled occupations will suffer for the lack of highly intelligent and well trained workers in the workforce.
In the US these low-performing, high crime rate immigrants are coming largely from Mexico and Central America. Canada is experiencing somewhat less of an effect due to the buffer of the US between Canada and Latin America. Even so, Canada is becoming far more diverse over time, demographically, due to immigration from East and South Asia, as well as the third world -- and Europe. But a higher proportion of Canada's immigrants are well-educated and well into their middle adult years, and less prolific at child-bearing.
The US was the beneficiary of immigration from high-IQ countries in Europe and East Asia during its 19th and early 20th century expansion. But since the radicalisation of US immigration policy -- encouraging immigration from low IQ countries -- the US is beginning to experience the negative side of immigration.