There used to be a landbridge from Alaska to Asia, but it's been engulfed under water for a long time now.
The Pacific Ocean is big (the biggest ocena, even), but it's still smaller than distance between Japan and Europe.
---EDIT---
Map
From the looks of it on that map, USA's West coast and Europe's Eastern border is about the same distance to Japan. So, I don't have any real idea why we get second dibs. Maybe 'cause we're mad crazy about spending money?