In this Hoover Institute video, Mark Steyn discusses his book, America Alone. What seemed to be a depressing discussion of the fate of Western culture ends on a hopeful note.
But, in listening to the discussion, it suddenly occurred to me why our southern borders are still open. Put simply, the declining birth rate amongst Americans of Western ethnicity threatens the underpinnings of the socialist state the Progressives have been working to impose for the last 100 years: there won't be sufficient young workers to pay the bills.
The same thing happened to Western Europe. Their solution was to import large numbers of Muslims to do the work. The Progressive solution for America (and, possibly, Canada) is to allow unrestricted flow of Hispanics north to fill the gap. Both ethnic groups have birthrates high enough to provide the support the socialist state requires over the long run. In effect, the Progressives are creating a new slave class.