Thanks for getting the discussion started!
I like your insight that you should build a lot of artillery up front, and then switch to a stream of infantry over time to replace casualties. I think I disagree with your suggestion that the Americans should be routinely landing troops in Greece or Egypt to march on Istanbul – there are times when a small landing in Serbia can cheaply liberate some very valuable territory in the Balkans, but I think Istanbul is just too far from New York for an attack on Istanbul to pay off. I usually find that I need to deliver troops to Normandy or Rome in order to save France or Italy from collapsing.
I don’t think I understand what you mean by “just try to stay alive.” What does that mean, in practical or concrete terms? What should you buy? Should you make any attacks? Should you stack up in your capital, or on the front lines? Etc.
I’m also a little more bullish on planes than you are – even if you only have 3 artillery in a stack, that’s usually enough to justify buying a plane if your opponent doesn’t have one. The plane attacks at 2, and it boosts your artillery by +1 each, so you’ve got a fast mover that essentially attacks at 5 instead of attacking at 2. Think of it like buying the occasional 6 IPC tank in Global or 1942.2…it’s not efficient, exactly, but in small quantities it’s a worthwhile addition to your infantry stack for its offensive punch and mobility.