To start this timeline off, i'd like to point out that this is my first discussion ever. I welcome collaboration from anyone knowledgeable on these topics; let us begin.
Nazism was like a fire, it burned hot but was snuffed out quickly. So to begin this discussion, I must go into some background about the third reich. My views are not politicized in any way. Hitler believed their to be a superior culture and race of humans; the Aryan race. This race consisted of people from Germany, France, the United kingdom, and several other countries. Hitler's eventual goals were to make them loyal to his country, in a peaceful manner.
Just not so, Hitler had no interest in somehow taking over the UK in the 1930's, he entertained some hopes of allying with the British, but they were by and large based on Hitler's imagined version of the British and their Empire that had little to do with reality. Also he pursued a series of economic policies that all but guaranteed British hostility, which brings us to the next point...
This was working before world war two; many popular leaders in these countries they wanted to reform their economies like Germany's economy as It was the fastest growing nation on Earth.
This is just not remotely true. Hitler inherited an economy in trouble and made matters worse. Refusing to devalue the Reichsmark, pouring what money and resources were available into the creation of military-industrial complex that did nothing for the regular economy as even when it employed people the need to diver resources to rearmament meant to civilian production had to be artificially squeezed. It's a complex topic and with apologies to everyone else who is probably sick of hearing it mentioned I'm going to suggest you read 'Wages of Destruction' by Adam Tooze to get an understanding of the Nazi economy.
Hitler's true goals in the 40's went as shown:
1Defeat the polish (This timeline without the allies declaring war on Hitler he would be more demanding, and take even more of poland)
2:Improve relations with France and the United Kingdom (To avoid a war that would damage his fellow Aryan nations)
3:Set up defences on the Soviet border and invade Lithuania to restore former Prussian lands of western Lithuania.
4:Invade the Soviet Union
5:Support the fascists in a French civil war (If France exploded into a civil war)
6:Break his alliance with Italy and invade Italy, controlling northern Italy directly and setting up an Italian puppet state for everything south of Milan.
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With the exception of 1 and 4 none of those were Nazi goals, and Hitler would have been willing to allow Poland to survive if they had been willing to join Germany in an anti-comintern pact. I've already mentioned that any hopes of improving relations with Britain were rendered impossible by Hitler's economic policies in the 30's, before he even started his land grabs. As to France, Hitler had no intention of improving relations with France. Breaking them as a military power and reclaiming Alsace-Lorraine was as much a part of Nazi policy as conquering the USSR. Hitler was oddly loyal to Mussolini, there was never any suggestion that he wanted to invade Italy prior to the military need to do so after the Allied landings and the collapse of Mussolini's regime.
How would this happen? The allies didn't really want to declare war on the Axis in our timeline besides Winston Churchill.
Again not so. There were many politicians who saw Munich as little more than buying time, whether Chamberlain was among them is up for debate, and pressed for an acceleration of rearmament. The guarantee to Poland was a result of political pressure on the government, by far more people than Winston Churchill, who was a backbencher with little power during the 30's. Churchill did not become Prime Minister by some fluke either, he got the job because parliament would support him, they wanted someone willing to fight, not a discredited appeaser.
The people could have easily stood against a war, and rise for the fascist and isolationist leader Oswald mosley would rise incredibly. He would coup the government of the United Kingdom with the help of the king and establish a system where Oswald ruled with power and the king just was slightly more powerful than our modern day king. Parliament would be abolished.
Sorry but this is just complete nonsense. The people weren't enthusiastic about war, but they were willing to support it. Hitler had shown himself to be utterly untrustworthy and apparently possessed of an unlimited appetite for conquest. Even though people still bought into the myth of 'the bomber will always get through' and imagine gas bombs raining down on British cities practically from day one they still supported going to war. As for Moseley he was a spent force by 1939 and the notion that the public or the military would have supported a coup is sheer fantasy.
What would actually happen? Hitler would successfully achieve all he wanted besides a complete invasion on the Soviet union. He would draw a line from Stalingrad north. Everything east Stalin would rule.
Bit of leap from the British don't declare war to a successful invasion of the USSR, indeed if there is no war in the west to distract Hitler the USSR is going to be on much higher alert level and its quite likely that Hitler will insist on attacking sooner, compounding Germany's problems. Lets also not forget what such a victory means, the wholesale enslavement and murder of tens of millions of people.
Siberia is basically impossible to invade. The u.s probably still would go to war with the Germans, and beat the Japanese.
Why is the USA at war with Germany? If Britain isn't at war with Germany there's a good chance that Roosevelt doesn't run/doesn't win in 1940. Hitler has an entire continent to digest before he even thinks about the USA, especially if it retreats back into isolationism. Japan may go to war with the USA, but with the British not bogged down in a European war its unlikely that Japan can succeed in taking Malaya and Singapore, so its likely to a short war.
The united states would fail against the German army as it defended all of it's coasts with the best armies in the world. The u.s would surrender giving the Germans war reparations.
And now you're sliding into pure Nazi fantasy, unless you are talking about generations of military build up by Germany...
Italy would be invaded because of it's inferior race. Hitler would also negotiate with the u.s to bring the Japanese back to a independent nation; the Japanese were to Hitler honorary Aryan people. Germany would most likely be in a cold war with the u.s after 1950. They both would develop atomic weapons.
...And it turns you are talking about 10 years. Just not going to happen barring civil war in the US or Yellowstone erupting.
I am going to leave this scenario here! Looking for collaboration and feedback!
To summarize my feedback, this scenario is a bigger fantasy than 'Lord of the Rings'.