@barnee I’m not recommending a naval base in Mexico; I’m just pointing out that Cornwallis’s plan of repeatedly shucking units between Mexico and southwest Africa seems to imply the presence of a naval base there. I agree with you that such a naval base is ill-advised.
I think there is very little point in shucking fast movers alone to west Africa – the extra defensive value in, e.g., Cairo is not worth the cost of the transports, let alone the naval base. America starts with only one transport in the Atlantic. There’s no sense in building up a fleet of American transports unless and until you’re ready to seriously challenge a sea zone that can actually put real pressure on the Axis.
If for some reason you really need to defend Cairo, American fighters will be more efficient. For example, if you build 3 transports on turn 1, then you have a fleet of 4 transports, meaning you can shuck 2 fast movers to West Africa per turn. You admittedly start with 4 mechs that aren’t urgently needed elsewhere; let’s say you buy 2 more mechs and 2 tanks to give them a bit of offensive punch. So now over the course of turns 1-4 you can ship your 6 mechs and 2 tanks to West Africa, and they will arrive in Cairo by turn 6. This costs the US $21 for the transports, $15 for the naval base, and $20 for the extra mechs/tanks – a total of $56 to get 8 hit points into Cairo that defend with 24 pips.
Alternatively, you could just build 6 fighters for $60. That gets you 6 hit points into Cairo by turn 4 (reach West Africa on turn 3) that defend with 24 pips. You arrive notably earlier with a force that’s very nearly as powerful as the mechs/tanks, plus your starting mechs are still available to fill up transports going to, e.g., Hawaii or to prepare for a later assault on Gibraltar.
All that said, one of the many advantages of a Middle Earth strategy is that you can safely withdraw from Cairo into Sudan/Jordan. It’s not urgent for the British to hold Cairo if the Allies don’t build a factory there. The UK can build 6 new units/turn (from S. Africa & Persia) that can attack Cairo, plus most likely some support coming in from India, Malta, the troops you divert to clean up Ethiopia, and so on. By contrast, Italy is very unlikely to be able to get anything like 6 land units per turn down into the region while also defending against, e.g., American subs. Over time, the balance of power will shift back toward the Allies and you will force the Italians back out.