i live in the US and I am vacationing in Mexico. Will I be able to live stream US television if I take my iPad?
No, streaming is restricted to the USA due to programming rights. You can, however, download up to 10 episodes and/or movies to your iOS/Android device before leaving the US and watch them anywhere - even when offline.
My only problem with that answer involves premium channels. I was in Scotland at the beginning of September and tried to access the season premier of a show via the Starz App. Because I was outside of US, I needed to confirm that I was a Starz subscriber and Xfinity/Comcast was the only major US company NOT listed - had I been an AT&T, Fios, or Direct TV subscriber, I would have been able to watch the show (as I have Starz in my very expensive current package). How does that have anything to do with US programming rights?