Android

Can someone please explain to me why all the magazines and books in US bookstores on the Android platform or Android apps are UK based (pricing is all or mostly in pounds, addresses for subscription services are in UK, etc.,)? Android is via Google, an American company, thus I don't get why pretty much all (OK, I found 1 written and published in the US) of the magazines and books coming out of the UK. All input helpful and welcome.

Also, I have asked this before with no response so another try... Can anyone recommend a good book or magazine to pick up for someone who is new to the Android platform (first smartphone so the learning curve is feeling a little steep)?