IMO immigration would focus on merits AND integration more than length of residency. In the past by physically traveling and being in another country is a testament of the financial means and the willingness to adopt the new culture.
Nowadays traveling is much easier and many immigrants are simply, put it harshly, colonizing the foreign country instead of adopting it.
Nowadays traveling is much easier and many immigrants are simply, put it harshly, colonizing the foreign country instead of adopting it.