The Pacific route may like an attractive path, but in practice, it take much more naval investment to protect the transports.
Typical air and naval:
Germany - 5 fighters, 1 bomber. 1 fighter is usually lost in ukraine and baltic fleet is sunk by uk
Japan - 2 battleships, 2 carriers, 5-6 fighters, 1 bomber, 1 destroyer, maybe 1 sub, + any transports japan bought.
Japan starts with a much larger naval threat, and US would need to invest 50-150 IPC for a US pacific fleet to survive.
Also, the Atlantic route is shorter than you’re describing.
The typical starting route is for land units purchased in East US to move to east Canada. From there, a transport can move it to Algeria each turn. From there, transports can threaten South Europe or West Europe. US also has the option of placing a fleet in the Mediterranean Sea. That fleet can transport from Libya to Ukraine, Caucasus, trans jordan, Southern Europe, and Western Europe. A US1 buy of 1 carrier, 1 transport, and land units is a great start to accomplish this.