based off the German thread, keep it realistic no "Nazis and Japanese taking over the US by 1947!" and such, feel free to only answer for countries you have ideas about, and if you have ideas for a nation not listed feel free to lay out your idea, I'm only limiting it to the big one's because I don't feel like listing all the nations in this war
PoD for several of these: FDR has a health crisis in 1940, just before the DNC, and must withdraw. In the confusion, Sen. Burton Wheeler (D-MT), a fanatic isolationist, is nominated and defeats novice candidate Willkie.
Deprived of all U.S. support, Britain tries to carry on the war alone, but by late 1941 is falling apart, especially after Japan seizes SE Asia and sweeps the S. Pacific. (Wheeler personally vetoes U.S. intervention.) Britain is forced to make peace in 1942.
China- alone - fights on for another two years, till Japan begins using bacterial and chemical weapons against holdout areas. Roughly 50M Chinese die; the survivors become Japanese slave laborers.
USSR- As OTL, until the end of 1942. German reserves that were OTL in N Africa or the west meet the Soviet counterattack at Stalingrad, which fails with enormous casualties. The Soviet people reach exhaustion. There is no Lend-Lease to prop them up. Shortages of everything, including food. In the summer of 1943, the Germans shred the Soviet lines and take Moscow; Soviet morale collapses. Stalin resorts to further mass purges, provokes mass desertions and rebellions. The Germans reach the Urals.
As in OTL Poland, Germany loots, murders all potential leaders, enslaves...
Japan- PoD: Operation Flash succeeds, killing Hitler in March 1943. The Black Orchestra moves against Goering in mid-1943, and begins trying to negotiate a surrender. By 1944, the Allies finally start to talk. The Euro War ends in April. At which point the Manhattan District shuts down. Many of the lead scientists bitterly disliked the idea of the Bomb, and only worked on it because Nazi Germany might get it first. That's gone... and the "conventional" armed forces want all that budget.
So there is no atomic bombing of Japan. While the Soviet Army overruns Manchuria, Korea, and north China, U.S. and British forces wage incredibly bloody struggles for the Home Islands. The mass murder of all Allied PoWs and civilian internees (which almost happened OTL) encourages Allied forces to "kill 'em all". Meanwhile, food production and public health collapse throughout Japan, killing tens of millions of people. The fighting finally ends in 1947, with 1/3 of Japan as a Soviet zone.
Poland- as with the USSR.
United Kingdom- As above for China, except that Britain does not make peace. Spain joins the Axis. Also, in the Mers-el-Kebir incident, the beloved only son of a senior French intelligence officer is killed. The grieving father tells the Germans all about Enigma decryption (France was equal partners with Britain in this in 1940; in fact the refugee Polish cryptanalysts worked in France. They even continued to work in Vichy France until 1942.) This hurts really bad in the Battle of the Atlantic, and in the Med. Britain staggers along.
As the eastern front winds down, Hitler directs shipyards all over Europe to build 500 - 1,000 ton escort craft and transports suitable for amphibious ops; also aircraft.
Britain is really stretched. Japan has taken Australia and NZ out of the war. India, cut off, has deposed the Empire and gone neutral, the Middle East has fallen, South Africa has gone neutral under Afrikaner rule. The "Empire" consists of Canada and the West Indies.
In 1944, Germany invades and conquers Britain. There is fierce resistance, to which the Germans respond with indiscriminate firepower and brutality.
France-
Germany-
Italy-
As above re FDR; also, however, the Allies defeat the invasion of Norway.
This scrambles the rest of 1940, delaying the German invasion of France, which bogs down against better preparation, though still largely successful. Then in 1941, Hitler gets Italy and Spain to join the war, crushing France and sweeping the Med as well, while Japan sweeps in the East as above. Britain makes peace. Vichy France becomes an Axis ally.
Stalin now expects German attack in 1942; he's right. However, the Soviets are much better equipped than OTL 1941, and they are alerted and ready - so no sucker punch.
The Axis still wins the opening battles, but far less decisively. Axis forces stop at Narva, Smolensk, and Kiev - then Soviet counterattacks begin - and never stop. The war ends with Soviet forces in Sicily, Brittany, and Andalusia. Stalin does his worst across all Europe, with no allies to restrain him.
United States-
go wild, I'll have my own ideas latter after some thinking