>If that is the case why is Canadas population expanding almost faster than ever recorded???
...because of immigration? Birth rates have been far below replacement for decades now.
https://en.wikipedia.org/wiki/File:Total_Fertility_Rate_of_C...
I don't think 10x your immigrant population in 2 years is demographically the same as a natural population growth over 10 years.
They result in 2 very different distributions. One having a very large segment of the population in one specific age category. Which also puts a lot of pressure on systems / infrastructure that is relevant to that category.
You would think to combat birthdates you would increase immigration to an appropriate level not 10x it in 5 years.
Secondly immigration has a complicated affect on demographics since the people coming are generally 21 or older which is very clearly different than a birth which starts at 0 years old