"By comparison, look at how a single digit percentage influx of foreigners rattled Europe." Islam played a role in that. Europe and Islam have been on mostly f

"By comparison, look at how a single digit percentage influx of foreigners rattled Europe." Islam played a role in that. Europe and Islam have been on mostly fighting terms since around 700 AD. There is much smaller cultural difference between the mostly Hispanic immigration into the US and the mainstream American culture than there is between the mostly secular European cultures and people from, say, Afghanistan, who express significant support for things such as Shari'a law.