Well that's sort of the nature of influenza. Given the USA's relatively small population and high level of access to and education on sanitary practices it's much more likely that new strains will originate elsewhere. The big four pandemics of the last century all originated in other countries. I'm not sure what the presence of people "from elsewhere" has to do with anything, as influenza is perfectly happy hopping a lift around the world on whatever flight is most convenient. I doubt one is more likely to catch the latest superflu strain from someone from, say, China than the guy down the street who caught it picking his wife up at the airport.
Also I'm not entirely convinced there is significantly more of an "influx of folks from elsewhere" than in years past.
Have you picked up a child from a local public school lately. One can not have a conversation with many of the parents un-less well versd in more than one foreign language. Not criticizing, just an example.