How did the Nazis plan to defeat America during World War II?

In the period 1940-1941 the United States was technically neutral but was already involved in the war on England's side. The US Navy was escorting convoys, delivering Lend-Lease shipments of armaments and food to England and suffering losses in the North Atlantic. The destroyer Reuben James was sunk by torpedo in March 1941. Hitler recognized all this in his speech to the Reichstag on December 11 1941, explaining his reasons for a declaration of war on the US. A video of Hitler's speech and reasons for declaring war on the US can be seen on Youtube.

Simple Answer: Adolf Hitler did not have a plan on invading the United States of America.

More Detailed Answer: Adolf Hitler first declared war on Poland, and then France and England. Using a technique called "blizkrieg," Poland, France, and the Low Countries quickly surrendered in the next three to four months. Then, Hitler attacked Norway, England, and some other countries North of the mainland of Europe. The only failure was England, which at first the name of the battle for the Germans was "Operation Sealion." Adolf Hitler abandoned his attack on England because RAF fighter pilots were taking a large toll on the Luftwaffe, the German air force.

Therefore, Hitler started an attack on Russia, then, the Soviet Union. Italy, Romania, Hungary, and a few other Axis countries cooperated in the attack. Eventually, this attack was reversed at the Battle for Stalingrad.

Basically, Adolf Hitler never publicly stated any plans of attacking the United States because he was so preoccupied in Europe. This next statement is opinionated: if Hitler did not even defeat the U.K., how in the world did he think that he'll beat the U.S.?

So, the United States never found any evidence of Nazi Germany wanting to invade the United States. I'm not entirely sure about England or the Soviet Union (or Russia).

Sidenote: Hitler had lots of amazing weapons on his side, such as the Tiger, the V1 and V2 rockets, etc. If he had more personal and material, he would have considered on invading the United States. But no, in conclusion, he never had the chance to plan out the invasion of the U.S..

The simple answer is that Adolf Hitler (to put it colloquially) was insane. Almost certainly a narcissist with a messiah complex, but most definitely incompetent as a military tactician. An amphetamine fueled trainwreck who forcefully asserted his control over tactical decisions and had an absurdly pronounced taste for the grandiose rather than the simply effective.

The invasion of Russia alone is a grand demonstration of his lack of self-control and inability to rationally plan ahead. It is one of the most obvious blunders in modern military history.

So as to the question at hand, it appears that Hitler had no realistic or reasoned plan to defeat the United States. All evidence points to him not believing he would need one. Your attempt to evaluate his decision seems to be based in the assumption that he was a rational political actor, which he almost certainly was not.

The man didn't think he could lose. When the war turned against Germany and the facade of his delusional infallibility started to crumble, he increasingly fell into depression before eventually killing himself.

Hitler's best chance was to conquer the "rest of the world" outside of the Americas, which he and Japan had the power to do, absent vigorous American intervention. The plan would be to conquer what I call the Euro-As-Af land mass.

Put another way, Hitler had to deprive America of a "critical mass" of world power. In both my unpublished book, Axis Overstretch, and a Second World War "take-off" on Civilization II, I hypothesized that the Axis would win if they ever got 50 percent or more of the world's industrial capacity (at least before America got the atomic bomb).

In my computer game, there were three other "powers" besides America opposing the Axis: Britain (counting the Commonwealth), the Soviet Union, and China plus a bunch of neutral countries (Spain, Turkey, Iran, etc., and four countries in Latin America.) Basically the Axis win if they conquer three out of four; say the Soviet Union, plus China and all the neutrals.

North America plus South America had just under 45% of the world's industrial capacity in 1941, according the Paul Kennedy in "the Rise and Fall of the Great Powers." America needs to retain "neutral" Latin America plus one other power (Britain, the Soviet Union, a conquered Japan, or "Greater China" (all of China plus Southeast Asia) to survive.

To quote from "Axis Overstretch," "As powerful as was the United States of America, she could not survive alone in a world full of enemies. She would even have a very precarious existence if her only friends were in the Western Hemisphere." Hitler's way to win was to "lock out" America from the Eastern Hemisphere.

There were some plans like the Amerika Bomber (https://en.wikipedia.org/wiki/Amerika_Bomber) that also could be used to deliver an atomic bomb. There was also plans to launch bombers from the Azores.

There were also plans for V2 rockets launched from U-boats.

As Oldcat said, no, Hitler had no plan for defeating the US outright. He didn't need to have one. It was enough that he believed that the Japan had one, and could carry it on up to victory.

Thus, his declaration of war against the US was a strategic move, very similar to the declaration of war by the UK to Japan at about the same time. Churchill explains well the reason of this move in his war memories. At first glance, it makes not much sense for the UK to declare war at Japan: the UK could not do much against Japan in the short term, being too far and too busy, and declaring war just gave Japan pretexts to attack UK's colonies in Asia like Singapore, Burma (which were indeed invaded by Japan), India (which was not) and allies (like Australia). However, Churchill's aim in declaring war to Japan, after Pearl Harbor, was simple: to secure a complete and definitive alliance with the US, until the end of the war, by being at war against the same country. While Churchill had no plan for the UK to defeat Japan, or even to help defeat it in a significant way, he believed in the power of the US and its ultimate victory against Japan.

Hitler's decision to declare war to the US is symmetrical: he just had the opposite view on the power and weakness of US and Japan than Churchill. Of course, he was delusional on this respect, and Churchill was right. But his delusion concerning the weakness of America was old and well-entranched, based on his contempt for democracy and his false vision of how Germany lost WWI (in his vision, the US played no role in it, it was the "stabbing in the back"). Concerning Japan, he was very admirative of their military power. A saying that was repeated around that time in the elite of the third Reich was that "Japan was invincible, having never lost a war in 2000 years". Understand: by declaring war to the US, Germany ties its destiny to Japan, and thus cannot lose the war. (Reference for this paragraph: "Hitler and America" by Klaus P. Fischer, university of Pennsylvania Press).

Hitler's expectation, which was initially correct, was that the United States would not enter the war. In fact, he did not even think Britain would declare war on Germany. When Britain did, he reportedly was deeply shocked.

The main "plan", if you can call it that, was what was called "fortress Europe". The idea that once united, the nations of Europe would be too strong to be defeated and the United States would just give up attacking.

There was also the "super weapon" dream that technologies like rockets, jet engines and nuclear weapons would eventually turn the tide of battle. These were more like hopes than plans.

The key piece of the puzzle you are missing is that Hitler was bankrupt. People who are out of money do desperate things. They are like a junkie who does one robbery after another to solve his immediate problem, without regard to being on an unsustainable path.

At the time Hitler declared war on the U.S. there was no existing plan for how to win it at all.

In fact, based on all the information I have studied, I have come to the opinion that the timing of the whole thing was more about the German military situation in Russia at that moment. I really don't think Hitler had any plans of a serious German war effort against the U.S. ever. Or at least not before England was dealt with. Something that was still a year or two away.

The following supports this opinion:

Short of saying it in a speech, Germany couldn't DO anything that would make a real war difference against America. Hitler did lift the ban he had on German U-boats attacking U.S. shipping but they were still looking more to enforce a naval blockade against England or sinking Russian shipments.

What is the point in giving America justification to join England in any overt actions against his Reich at that time? The answer is there is no point. Making dumb moves like that fits the Hitler of the comming desperation times but not of late 1941. The Hitler of 1941 still worked situations to his benefit in most cases.

It was during the very week of the Japanese attack on Pearl Harbor, operation Barbarosa ground to a halt at the gates of Moscow. Right after the stall (December 5th and 6th, 1941), the Soviets attacked German forces around Moscow with forces that included 70 fresh divisions of well equipped, Siberian troops. Troops that the German High Command didn't think were available.

http://www.ibiblio.org/hyperwar/USA/USA-EF-Decision/USA-EF-Decision-4.html

From the 5th on, the Soviets began a counter-offensive and were making small gains (a mile or less) in several areas. On the 6th, Soviet Thitieth Army broke into Third Panzer Group's left flank northeast of Klin to a distance of eight miles, almost creating a complete breakthrough.

German generals were reporting all along the line about the fresh, well trained and equipped Russian Siberian forces. For the next several days German forces were retreating west from Moscow.

Early on, it looked at times like the routs the German were accustomed to creating but they were the ones on the run. On the 10th of December, Guderian characterized his Second Panzer Army as a scattered assemblage of armed baggage trains slowly wending their way to the rear.

Hitler knew very well everything that was happening along the front. He was updated several times a day. He knew his armies were stalled and falling back. He also knew that unless something changed quickly, the Moscow objective could not be accomplished in 1941.

Though its certain he was shocked as this type situation had never occurred up until this time. Still, Hitler was not at a point where he was delusional and making up defensive formations yet. He knew Germany had a real issue here and likely thought he could work their way out of it.

In addition, Hitler was aware that his nation's strategic fuel reserves were low and some of the German armies in Russia were well short of normal strength. He had plans for how to get troop strengths back up but the oil situation alone threatened everything.

In order to turn the situation immediately, Hitler was looking for ways to change things on the Russian front. It is my opinion he hoped declaring war on the U.S. would induce Japan to reciprocate the gesture by declaring war on the Soviets. Or at the least, he hoped to persuade his ally to create concerns along the Russian border.

The Soviets and Japanese were not allys by any stretch. Rather, they were old enemies. In fact, Stalin had feared a Japanese attack on the Russian Eastern border since the war bagan. It was very reluctantly--and possibly out of desperation--that he had moved forces from there to the Moscow area. Even then it was only after Stalin's senior Japanese spy convinced him that Japan was looking East, not West.

If successful in influencing Stalin to pull some of these forces back, Hitler was still under the mistaken impression the Russians were completely out of reserves. He felt that victory was that close. If he could get the situation back to where it was just before the deep freeze began, they could resume the attack--and quickly win Moscow.

Other than his hopes for immediate help with the Soviet situation--which would have been admitted to NO ONE by the Nazi regime--it is unexplainable that Hitler would just up and declare war on America without substancial upside for his country at the time.