I took Romeo's advice, but let me tell you, I needed all the luck and then some!
1.1650. Nothing much, take a look at cities, do some very minor MM.
IT. American marines take Hastings and a bunch of troops and ships fortify inside.
2.1655. Kill 4 inf, 1 tank, 1 tow, 1 marine, sink some battleships etc. Retake Hastings.
IT. America builds the UN. Hope they hold elections

They also land 2 tanks near Canterbury.
3.1660. Kill 2 tanks, give Flight + 3 luxes to Sumeria for ROP. They need lots and lots of help.
IT. Transport headed for Sumeria survives privateer attack.
4.1665. Keep shipping worker/infantry groups.
5.1670. Unload North of Muscat (close to front lines) and also North of Ur (in safe Sumerian area).
IT. Massive bomber attack. Lose 1 inf, 2 cavs, 3 slaves next to Muscat. Whatever happened to the front line? Oh, man. Looks like the Americans can take out anything on the continent whenever they feel like it. Bombers kill 2 tanks guarding some workers well behind Sumerian lines. They're targeting us on purpose. Workers survive and start building fortifications. They can't build airfields in friendly territory

and they are stranded, since their transport was sunk right after they disembarked.
6.1675. Palace expands, our fighter sinks a privateer after artillery redlines him.
7.1680. Shipping more troops. Now that it's apparent how deadly the other continent is, we need to pick a much more conservative landing zone.
8.1685. Going around West through Sumerian waters, that looks out of range of bombers.
9.1690. Nothing sank, good. Land and rush to the only hill in neutral territory. Build an airflield. Airlift a bunch of defenders and fighter planes. Dig in and pray.
IT. Massive air/armor assault, kill 4 tanks and lose 4 infantry and 1 tank. The air base holds! Palace expands.
10.1695. Kill 1 inf and 3 tanks, lose 1 tank. Massive airlift, mostly defenders and our first surface-to-air missile battery. Bombrd and sink BB, CA, DD, transport approaching England. Yes, we have some bombers on defense. Not enough for offense yet. We're building tactical nukes, mech infantry, and jets. Convoys with armies and artillery are on the way. Everything else can be airlifted from the airfields dotting the tundra in the South.
Techs stolen: Atomic Theory, Electronics, Rocketry, Space Flight, Fission, Computers. I gave them all to Sumer so they have a shot at holding on.