AHC AND WI Nazi base in Greenland

Could the Nazis have set up something from which U boats and aircraft operated on Greenland?

If so how big of a problem is it?

Query could it bring the US into the war earlier?
 
And likewise the United States won't allow that base soo close to Canada and America's Atlantic coastal region and easily threaten to interdict America's trade routes....
 
It will never happen in the war
The only way for it to happen is to ask Denmark (or coerce, for that matter) to build a base there before the war starts. Then again, Americans might see the base as an excuse for espionage, and Hitler has to be in very good terms with them to build such base.
 
Actually the germans had landed in Greenland and install a small camp, during WW2 !

Unternehmen Holzauge aka North Atlantic weather war

in august 1942 leutnant Hermann Ritter and group of 17 meteorologist arrived with trawler Sachsen in east greenland.
the group manage to be undetected until march 1943 and transmit weather Data back to motherland.
until a sledges patrol of danish, found the installation, after 600 km trip the Danes were abel to contact the authorities
on 25 may the USAAF bomb the camp and remains of trawler Sachsen
then 6. and 17. the surviving member of Operation Holzauge were evacuated by flying boat, while there remains of camp and Sachsen were destroyed.
 
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