A hostile Eurasian alliance and the US two-ocean dilemma

How would the United States react if a British-German-Japanese alliance defeated and dismembered France?

Concern would centre on the resulting two-ocean threat, pushing the United States toward either accommodation or major rearmament.

Sentiment for France alone would probably not drive an immediate American reaction. The strategic problem would be what the victorious alliance could do next. A Royal Navy aligned with German land power would demand attention in the Atlantic, while Japan would still require a strong Pacific watch. The United States could not comfortably cover both oceans and might seek accommodation or fund a much larger military establishment.