They seem like a very good balance from what I can see. You haven't got too much Science, or Arty subjects which is cool. A balance is always good for A Levels (talking to someone whose learnt that lesson)
Your second question though, I don't really know how to answer you because I don't know your exam boards.
I did AS History and we did Politics so looking at Labour and Conservatives from 1945 (Atlee's Lab gov) to Thatchers rule in 1990. We also studied War of the Roses (1455-1509)