[BroJoeK]

"By the end of 1941, Hitler had more than enough reason to believe war with America was inevitable. And the Germans were correct in their assumptions in the article."

Agreed.
The Roosevelt administration denied details of today's report, but not it's basic idea -- that the US would eventually come to the allies' side.

So the US claim of "neutrality" was a technicality at best, but one in which Hitler to some extent participated -- i.e., by ordering his U-boat commanders not to sink American ships.

Still, it's obvious from "today's" Nazi propaganda that they don't believe this technicality will remain in effect forever.
Even in early 1940, Nazis considered the US, if not an immediate enemy, a certain future one.

And all of this well before Hitler has invaded Scandinavia, or Western & Southern Europe, Russia, the Baltics or Africa.

So my question remains: why did the thought of eventually going to war against the US (and Russia!) not give the Nazis pause to think before embarking on their conquests?

[Homer_J_Simpson]

So my question remains: why did the thought of eventually going to war against the US (and Russia!) not give the Nazis pause to think before embarking on their conquests?

Hitler had a screw loose?

[PzLdr]

The war was always about Russia, from Hitler's point of view. That's where the Lebensraum was, and where, in his opinion, the future of Germany lay. Almost everything done diplomatically by Germany in the latter half of the ‘30s was done to that end, including a rebuffed offer to prewar Poland to join the Axis, in return for Danzig, the Corridor, and free passage for German troops to the Soviet Union.

Hitler ordered the initial preparations for BARBAROSSA in June of 1940, BEFORE the French sued for an armistice. So Russia was always going to be a war objective.

As for the U.S, Hitler probably initially saw that as a more distant opponent, after victory in Europe, consolidation, and further rearmament. But U.S actions, and belligerence [in practice] no doubt moved his calculations forward, and Japan's initial surge probably tipped the scales for then as opposed to later.