Hunting for Butterflies: U.S. purchases Greenland

Say that one of Seward's deals goes through, or perhaps Greenland is offered alongside the Virgin Islands, and the U.S. ends up buying the big icebox from Denmark.

How does this affect 20th century history?
 
If you go with the latter POD (somewhat tough, given that one of the conditions of the purchase of the USVI was recognition of Denmark's claim on Greenland), the first big butterfly comes in 1939/1940/1941, as Germany begins submarine warfare against Britain. With the US in possession of Greenland, there's going to be somewhat of a change in the "Neutrality Patrols," and you'll see at least a few east of Greenland as early as 1939, instead of 1941.

Depending on how heavy the butterflies are, this might turn out to be inconsequential, or it might not. If nothing happens, then history may very well stay on course for something close to OTL. But there is a strong possibility that with the U.S. Navy aggressively patrolling so far east two years earlier than OTL that there could be a Ruben James incident (or several) earlier than OTL. That might be enough to get the United States to enter the war on the side of the Allies earlier, or Hitler might be provoked enough to declare war on the United States earlier. Things get crazy after that.

If the war goes as OTL, however, then the biggest butterfly might be the extension of the DEW Line to cover Greenland and the establishment of a few more American bases in the far north.
 
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