Replied to the wrong comment. Leaving it because.

Americans are the premier naval power.

Hawaii, Midway and other Pacific islands having monitoring stations.

The Pacific isn’t as easy to cross as you think due to it’s size and it has some nasty ass storms.

Pair that with the coastal regions usually having cliffs rather than somewhere a landing craft could pull up and it isn’t easy for a start.

Now mix in people who know the terrain and don’t want you there.