Twist the knife some more, Jolla. Skip some more rocks across the pond, why don't you. It's already enough that they don't support NA 3G bands, but they're not even willing to ship to NA? Jeez...
This is a sincere question. What US regulations are interfering with Jolla's ability to ship phones over here? I can't think of any that could.
It is not the sole reason, though - the second reason (and also an important one) is the state of the US phone market. Unlike any other market I know, it is completely controlled by service providers - people don't buy phones in a (e)shop, but from Verizon/ATT/etc. . Therefore it is almost impossible to reach any significant sales for a startup.