This article is especially interesting, given it was written before the the US entered the war and before the full extent of Nazi atrocities was known. I'm reminded of C.S Lewis's speech about the Inner Ring (1944): http://www.mit.edu/~hooman/ideas/the_inner_ring.htm
I wonder what would have happened if Hitler (who apparently didn't give the matter much thought) hadn't declared war on the US? https://en.wikipedia.org/wiki/German_declaration_of_war_agai...
If Hitler hadn't attacked Russia, things could have been very different. Hitler thought Russia would be a fast, easy conquest. It wasn't, and Germany found itself in a two-front war. It cost the USSR 20 million dead to beat Germany, and cost Germany 5 million dead, 80% of German casualties. Germany was an ally of Russia until 45 minutes before the attack. Much of Russian paranoia comes from this.
If Germany had consolidated its gains on the continent of Europe without trying to expand beyond that, we might today have a Greater Germany covering much of what's now the European Union. Britain would be on the outside, in the position Taiwan is now with respect to China. Russia would be the big power next door, just as it is to China now. Germany could have cut a peace deal with the US and Britain in that situation.