You can’t realistically take a shot at the US till mid-game.
Here’s why.
J1 (Pearl assualt and taking of HI).
US 1 - buy 10 inf place on WUS.
J2 - what are you going to do assualt Mex, or Pan, or Ala???
US 2 - move 10 inf to W can, buy 10 inf place on WUS.
J3 - now what???
US 3 - buy trans and inf. Trans to EUS.
The US can still assault WE on Rd 4 (to back up the brits)
and Japan will never ever be able to get beyond owning Ala or Hi.
You have to wait till the US fleet has left the Pac and they have commited to Ger. (after rd 4 or 5).
In the meantime on J1-J5, you must take Chi, Sin, Ind, SFE, and be in position to take/trade Kaz, Eve, and Novo.
Now if you want to take a shot a Hi, Ala, and maybe sneak someone to Mex or Pan, maybe you can catch the US napping, but any attempt to early, and you could be inviting trouble.