Nation Of Immigrants? (part 2)

After the turn of the 20th century America needed more immigrants to settle the lands of the fruited plain. Immigrant labor built the infrastructure that later empowered the U.S. to liberate and rebuild Europe twice; (circa 1918) and again (circa 1945).
Historically, new immigrants be they Irish, German or Italian, had a difficult time gaining acceptance by the locals. They did demonstrate however, the desire to assimilate into the emerging culture. They shared attributes of their various cultures with the locals, who in turn shared knowledge from the collective culture of the prior assimilates. Many cultures did clash here. Eventually though, an alloy (if you will) resulted from the melding of so many cultures together - hence the super-culture theory.
The super-culture's pervasiveness knew no boundaries. Over the span of many decades its influence grew so far that it eventualy began defeating itself. People worldwide so readily accepted the universal values of liberty, consent of the governed and so on, that the idea of an American cultural identity became a myth. Our cultural identity is ill perceived simply because human beings naturally adopt it. The super-culture, resulting from a great myriad of cultures, could be destroyed by a massive and sudden influx of one powerful and ethnocentric culture from the south. A huge and unregulated infusion of Mexican nationals is likely to throw everything out of balance and F us all up hardcore.

Today's immigrants face different challenges than the ones that built this country. Today's legitimate immigrants must compete with a well calculated, illegal and overwhelming invasion of foreign nationals. Soon there may be talk of a moratorium on immigration (from the south) altogether.