It not just a matter " to what". Again the article talks about the fact that nations such as Canada and Australia policy is to allow LEGAL immigration based on need for certain skills in their country. What effect that has on reduction is a matter of their need.

Why would a nation allow unlimited number of immigrants to their nation who will only create a financial burden on that nation ?

Why would a nation allow H1B visas to immigrants if that nation had an ample supply of citizens in said occupation who could fill those positions?

Why would a nation allow immigrants into their nation if they refused to assimilate?

Progressive seemly act as if immigration legal or otherwise is a right of passage . It is not

The United States needs to control its borders and to have an immigration policy that results in a beneficial relationship for this nation. We already have too many takers

And finally in my view this issue isn't about race, etc its about a sensible immigration policy

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