What about the TV?
> helping people learn [ American ] English and understand a little more about American culture
I was under the distinct impression that american TV exports had already done that. All my english-as-a-second-language friends and colleagues have a recognisably american "twang" to their spoken english, usually picked up from TV programmes and the teaching material they were exposed to.
Maybe what these Kindles are for is to redress the balance a bit. To correct some possible notions that every american cop will shoot you as soon as look at you, that every crime can be solved within an hour and that their soldiers can drop into any country in the world, gun in hand (and suitcase, and shoulder holster and tucked into belt and another hidden in their sock - just in case) with impunity.
After all, this sort of programme has got to be cheaper than trying to teach their own citizens (or, it must be said: ours, too) another language.