Many countries embrace the heresy of socialism for example the South American countries, France etc. An increase in immigrants from this type of nation/culture will change a right wing country - Like America - over a period of time and their politics becomes confused to say the least. Democrats will get into power more often. The same kind of influence will happen with large numbers of muslims moving into western nations - including America.
Do not be fooled by the politically correct liberals in the nation. "Inclusiveness" logically includes the influence of other cultures and philosophies.
Therefore increased immigration from other cultures will change the mind set and present culture of the western nations. This may be a gradual process but it is a process.
As we speak western nations are being changed and not for the better.
ps; For an example of mind changing influence just look at the homosexual agenda and its success.