I mean think about it, what if Germany did manage to conquer Europe and looked towards the west?
An invasion on the United States though Mexico? Or Canada?
Bombing Campaigns on Houston, San Antonio, Dallas, Chicago, Boston, New York City??
Bombing Campaigns by the IJN on San Fransico, San Diego, Los Angeles??
What would it be like if All of Human Civilization was talking German??
What would the turnout of the war have been like if all of the desicive battles (Midway, BoB, Normandy, Stalingrad) were in favor of the axis forces?
Think about it.