US ships should be able to pass through the straits unhindered as long as Spain remains neutral.
An alternative is to make Gibraltar a British port within Spain (I’ve never liked that “Gibraltar” tt in A&A.) The UK can use it as long as Spain is not at war with the Allies; in order to attack it the CPs have to attack Andalusia itself.
Really, for movement and repair purposes, the UK should have NBs at Gibraltar, Malta & Alexandria; but without the ship building capability. That means two grades of naval base, however.
By small navy I mean small dreadnoughts; you might prefer to scale them down to cruisers:
http://en.wikipedia.org/wiki/España-class_battleship
Pripet should at lest be impassable to tanks, but then again we could say that about any mountainous area as well.
I’d also consider a French Congo tt.
This was (I think) the last map I did before moving onto the Roman Stuff:
note the division of Persia into Russian and British zones of influence.
