I really haven’t seen any strats that target the US that I think are solid. First off, in turn one when the entire Japanese navy converges on Japan, you have to figure it’s for a push on Hawaii, otherwise the farthest south you can push is the Phillipines and Hong Kong. When nearly your entire airforce lands on Japan I’m thinking you’re either going to try for Western US or Landing them in the Marshal Islands. Either way I’m the cautious type, I’ll usually err on the side of defending my capital, so the US buys 5 infantry, evacuates the Phillipines (fighter to Guam, bomber to Hawaii, and everything else to seazone 54) and moves a destroyer into midway to block a turn two invasion of Hawaii. Meanwhile Anzac fighters land in Queensland.
Turn 2, it’s now quite obvious what you’re attacking, US buys 8 more infantry. Since you now do not have any combat ships that can hit Hawaii the entire fleet masses there with the exception of a cruiser who stays on the west coast to prevent any shore bombardment in a J3 invasion. All airunits (including carrier forces) now land in the US, with the exception of the fighter in Guam, he flys to Wake. This leaves a total garrison of 16 Infantry, a mechanized infantry, an arty, a tank, 3 fighters, 3 tac bombers and 3 bombers. By round 2 the UK has snatched up the DEI.
Turn 3 lets assume you adequetly guard your transports, which means you’ll need to leave the bulk of your navy in sea zone 2. On the US turn I buy 7 infantry (leaving one IPC) and my only combat moves will be to send my sub to Japan to kill your unguarded transports (air units will not be able to strike my sub, and you have not bought any destroyers to protect your home sea zone) and two destroyers kill your two subs off the West Coast. Also the two transports in Hawaii now move four more infantry into the West Coast, the fighter at Wake lands there too for a total of 27 Infantry, a mechanized infantry, an arty, a tank, 4 fighters, 3 tac bombers and 3 bombers. Four Anzac fighters fly to Hawaii and South East Asia is probably in shambles by now.
Turn 4, as you mass everything in Alaska the US buys five infantry, a tank and four fighters. Leaving a defense of 32 Infantry, a mechanized infantry, an arty, 2 tanks, 8 fighters (12 when Anzac lands), 3 tac bombers, and 3 bombers, making it unlikely you’ll take America.