Ah yes, the eternal "what if they invaded" question. While the threat of an Axis invasion during World War II would be greater than World War I, I think the odds of a Japanese invasion would be even higher due to Pearl Harbor and all. Forget about German, the States would be speaking Japanese! Jokes aside, interesting find. Invasion through the Arctic seems like an interesting idea and perhaps the most successful since the Alaska Highway wasn't fully developed at the time and I doubt Canada protected that area much (depending on who you ask here today, they still don't!). Going through the U.S.S.R. is interesting as well, before the Invasion of the Soviet Union, quite a few Wehrmacht troops believed they were going to be granted passage by Stalin to travel through Russia and flank the British in the Middle East and parts of Asia (I think) and connecting with Afrika Korps. Others, like the "South America" plan are simply ridiculous on a logistical and tactical level. Most of the Axis fleet would have been destroyed before it even reached the coast.
Just a good thing to have on file if and when it becomes (or appears) feasible. On a related note, even Saddam Hussein had plans to take over the Continental US. In the plan, place names won't change, just the pronunciation: Al-aska Al-abama Al-quatras
Ah the Fuhrer idiot had not even won the USSR yet. Good luck. Another great number of OKH wasting their time. I know now for sure the personal doctor gave him morphin/cocaine. Did you know he injected was it a Bulgarian peasant feces under his skin to make his bowel work better although he made the problem himself. Eat pea soup and you fart all the time, I guess. Hitler did not eat meat. Only veggies.
Greenland and Iceland was the least feasibe because it is vulnerable to Royal Navy intervention. If a landing force had occupied Iceland, how would they supply it yet alone build up for Greenland? Even if the French Navy were to cooperate, the combined French and German Kriegsmarine could not challenge the RN. All those plans were conjectures as there were no ability of the Nazis to land in force to occupy the mainland United States. Ditto w/Japan.
[warning, extreme case ahead] If the US had gone "Inside our borders only!" isolationist I could see the Germans and Japanese making a deal with the Mexican government to allow "peaceful passage" of troops to invade along our southern border. In this situation the Mexicans would feel justified in believing that the US had abandoned them to their fate and making a deal would be better than having being an intermediate conquest on the Axis route to controlling the US. And I wouldn't blame them. The above points up the confused and contradictory nature of the America First coalition. Proposals concerning defense went from a New Monroe Doctrine to a theory that if we didn't have any colonies we wouldn't have to be involved in international politics. This part of the reason that America First never blocked a proposed legislation they didn't like and never got a bill passed that they supported.
I read in the Stillwell Papers that immediately after Pearl Harbor Mexico sent all five destroyers of the Mexican Navy to patrol the West Coast. Later they sent fighter squadrons too to fight the Japanese.
Mexico did send pilots (50 or so ?), late in the War. The 5th Air Force provided them with P47's that had been swapped out for the newer P51's. Only one squadron if I remember correctly early-mid 1945. I think their main mission was escort.
They sent pilots, who definitely earned their pay. If you're considered good enough to get a seat in a P-51 you'll do, oh yes, you'll do.