Hitler wanted liebensraum. I doubt very many Americans, no matter how pure their blood, are going to be moving into Greenland.
Strictly speaking, that came later, when Hitler broke the pact (between German General Ribbentrop and USSR General Molotov), when they divided up Europe between them, with Stalin staging a red-flag operation against Finland, falsely claiming Finland fired first, as the prelude to starting the division, in 1939. Hitler had a romantic idea as ideated in the late 1800's, of
Germania: a greater Germany. This saw anyone non-German as untermenschen, hence his surprise attack on USSR, 1942, as a pretext of replacing the Slavs with Germans. He called it 'Lebensraum' but that was just the rationale for the German army.
We see something similar going on with Trump and Putin. You recall when Trump visited Putin in Helsinki, 2018, he had a secret meeting behind closed doors with Putin without the normal protocols of at least one aide being present the whole time (we saw something similar when then-UK PM Boris Johnson, shook off his protection personnel and aides to attend a 'party' in Italy with former KGB agent Lebedev (and made his son a Lord!). We've seen Carlsson Tucker flirting with Putin in Moscow recently and Elon Musk helping to swing the US elections, not to mention Russian interference in UK Brexit.
So yeah, the post-election announcement Trump wanted Greenland is not just another of Trump's dimwitted outbursts, it is a deliberate signal to the world of his intentions, so that it doesn't come as a surprise when Trump attempts to make Greenland - and maybe even Canada - a US State, plus change the name of Gulf of Mexico to Gulf of America.
Notice who Trump has invited to his inauguration: far right leaders Meloni and Orbán but not the EU leaders, Macron or KCIII (who wasn't expected to attend anyway). His side kick, Elon Musk using X-twitter to spread far right propaganda.
None of this is innocent.
We have been put on notice.