Invaded and infiltrated are two different things.
The only “infiltration” of any consequence has been Latinos.
Yep the camel jockies have been coming, but even if they all were ISIS they are such a small population here that they might scare some folks, but unless they have a nuke, they are unlikely to be very effective up against 150,000,000 well armed and really pissed off patriots.
Our greatest problem is if the damn libs keep power they will give liberty away and will indeed have us overrun with those wishing to knock us off.
Infiltrated by different factions, communist and Muslim, in all areas of our society, but most dangerously at the executive level.