Bigger WWII Challenge

Your mission is to make World War 2 as big as possible. This means as many casualties and as much damage as possible. Your restrictions are as follows:

I) The United States, United Kingdom, and Soviet Union cannot surrender to the Axis. You may, if you wish, have the Soviet Union as part of the Axis, if you think you can pull it off. If they don't, Hitler must attack them around the same time as the US enters the war.

II) The Axis powers must be completely and totally defeated.

III) You can have the Axis develop nukes, but only if the allies do as well. And you can't nuke any US cities (thats just personal bias).

IV) The war can't end simply because of a few nukes (anything less than 4 nuclear attacks).

V) Don't take the easy way out and focus most of your efforts on China.

Have at it guys.

India

India becomes independent after WWII. A stalinist type takes over, annexes the Iranian oil fields, and builds a pipeline for gas to India. He grabs southern Tibet and puts 25 gigawatts on the Brahmaputra. Minerals they have, and a railroad across Afghanistan puts them in contact with Russia for joint trade of materials they don't have, in return for tropical crops.
His navy is big enough to keep Japan out of China, which means when WWII comes and Germany grabs the Netherlands and France, the Japanese can put their full navy and army and airforce into South East Asia, and just a holding force on the Yalu.
Hitler does WWII pretty much as in OTL. He grabs Western Europe in a single fast campaign and the UK drops out. The Balkans sign up, unlike OTL, with Yugoslavia staying in the Axis. Turkey comes in on the German side. Italy does not come in, which is one of the reasons that Yugoslavia does. Italy forms a Union Romance with France, Spain, Southern Belgium, and Portugal.
India and Japan are going at it hot and heavy in China and South East Asia, Russia and Germany are going at it hot and heavy in Central Europe, and the US stays out. Since most casualties in WWII were on the Russian and Chinese front, it doesn't make that much difference to the kill rate if we sit it out.
Russia fights better because after the UK drops out, they have no illusions that they aren't next. No surprise attack, no cauldron battles, etc. Germany promptly signs a much less nasty treaty with France, etc, so they can concentrate on the Russians.
Germany fights better because they have access to British oil from the Gulf, if not from Indian controlled Iran, and from Union Romance controlled Africa.
China fights better because it is united and it's territory is not at first partly occupied by Japan.
India fights better because they have had from 1919 to 1939 to build factories, and they are just concentrating on denying Japan oil from South East Asia, and supplying the Chinese armies over the Tibetan railroad line through Sinkiang.
The Anglican Union and Latin America stay out of it. Africa is mostly British or Union Romance colonies.
The US builds a nuclear force more quickly without a major military buildup like in OTL, and therefore much more cheaply. The airforce builds advanced aircraft and not nearly as many of them. Our armed forces have better quality weapons in general. Some plans we just buy from both the other sides, and captured equipment that both sides sell us.
We enter the war in 1949 on the losing side, just as in WWI. In this case that's Russia, China, and India. We have not just fission bombs, but fusion bombs. Luckily we only nuke Tokyo and Berlin and the weather isn't badly affected by only 200 megatons. It's sort of like WWI in the after affects.

Maybe a more widespread war. Mexico is taken over by a fascist regime, and so is a few South American countries. Death rates will be higher and the war will last a year or two lnger because of this. Nearing the end, Germany nukes Moscow, and Russia drops out of the war. The US wasted her nukes on Japan, and Germany nuked several Allied armies and English cities. In response, Americans used nerve gas. In 1948, Berlin, Nuremberg, Frankfurt, Kiel, and a German army group are all nuked. The war ends a week later. Hitler had gone insane in late-1947 from Parkinsin's dieases, and would not be put on trial because he's not competent enough. Instead, he is killed by a lone nut in a tall builindg.

India becomes independent after WWII. A stalinist type takes over, annexes the Iranian oil fields

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A long way for India to go. Iran's oilfields are in the southwest in Khuzestan.

Indian army geography

Anthony Appleyard said:

A long way for India to go. Iran's oilfields are in the southwest in Khuzestan.

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India had already occupied southern Iran in 1918. The Indian army (under British command) was already halfway across Iraq. This time they just stay there. Building the pipeline is what is expensive. Maybe a railroad as well? Connects up to the Iran/Russia railroad? Did the Iranians have a through road to Russia at that time?
Of course they could just ship oil in tankers, but that leaves them exposed to Japanese submarines. Maybe they start with tankers and then build the railroad and oil and gas pipelines in the thirties?