People obviously keep forgetting that Italy only switched sides when they were losing. French had allied Germany under
Vichy France. The whole winning Desert Rats Campaign is because the
Lend-Lease M3 Lee 75mm cannon is able to shoot far into Panzer tanks that the British didn't had earlier and constantly rely on the useless close range pom-pom guns in tank battles. Everyone forgets that there was an
Anti-comintern pact built up with Germany before Jap-China war happen which Germany supported Chinese first. First time Churchill tanks were used, they lost the battle. Without US Sherman tanks Firefly tanks don't exist, no effective anti-tiger tanks. British always had terrible tanks til US jumped into help.
US always had
War plans to dominate the world, so a scenario where US fights the world alone is highly possible as much as Nazi Germany and USSR.
Brazil had relations with Canada in 1941 before declaring war against Nazi Germany in 1942.
Brazil only declared war after sinking of their ship by German U-boats in 1942, just like US declaring war.
Many things will happen had US joined Axis. This scenario will happen if USA use War Plan Red first instead of War Plan Black which they used in WW2.
#1 No lend lease support for Allies like Britain or USSR. Meaning no Sherman, Stuart or M3 Lee tanks. Which will cost British from winning in African Campaign.
#2 Britain will fall instantly. Not only does Britain has to fight Germany, they have to now fight US naval Forces which will isolated British Isle from having military equipment brought over. This will change Hitler tactics from possibly invading the USSR Earlier and do a land invasion on Britain with US naval support.
#3 Italy will remain a German ally as it controls entire North Africa, thus help Germany against USSR even more in Operation Barbarossa.
#4 The divided French will no longer be divided supporting both Americans and German troops in France to plan invasion against USSR and Britain. Rebels would either give up or completely destroyed under Vichy France(French ally of Germany).
#5 Combine tactics of German famous U-boat army and US naval carrier groups, Britain would not stand a chance to defend itself from Naval Invasion.
#6 Canada and USA will weaken itself on constant war. Canada may end up losing or end up holding before ceasefire called, but the entire Alliance world would support Canada over USA. US will probably end up fighting in all over the world including entire South America Continent. Canadians have great diplomatic relations with Brazil. This might end up being USA fighting all fronts not just Canada in a long war.
#7 Possible Scenario: WW2 would probably end up lasting a decade more as USA will have different alliances and fighting multiple fronts including opening a South American Campaign while most likely only having Argentina as allies.
#8 Possible Scenario: USA might end up in civil war in the middle of the fight aligned with Germans because not only of atrocities of siding with Germany racism. Many people in USA would not agree with what Germany and Japan would be doing.
#9 Possible Scenario: Asia is the most tricky one because Hitler thought the Japs will open a 2nd front against USSR which they did not. Under "Anti-comintern Pact",
Germany first supported China during Japanese invasion, but later abandoned them due to being its hands full against British. US might be able to get
Germany to support China instead and maybe delay any invasion against USSR while everyone else targets British and the Japanese as the Japs were caught red handed doing atrocities against Chinese by Americans journalists.
Nanjing Massacre.
#10 Possible Scenario: If USA supported Japan under German axis alliances instead of China #8 and #7 will obviously happen while invasion against USSR happens with US troops in Operation Barbarossa.
#11 Spanish empire and Argentina will obviously join Axis alliance.
Portugal will probably remain neutral or Join USA as it joined the war later in 1943 allowing the setup of USA bases. Portugal and Spain was in a neutral
Iberian Pact. So they might stay out of the war as they are thinking who was stronger.
#12 Nazi Germany, Hitler is going die either ways because there are
German plans for regime changes which US might support for their war plan effort. Assassination plans changes. Like the new kills the old for power.
#13 Unlucky 13th other Scenarios after Axis domination or Allies won.
a) US vs the world
b) Never ending war for everyone that has to start from scratch after the Great WW2 while all leaders got ousted if Axis wins.
c) Nazi Germany(basically the Cold War enemy as USSR is gone) vs her allies and rest of the world.
d) Actual world peace with US supporting China to destroy both Fascism and Communism in a brutal way. With China on US side supported by Americans everything gets done, no easy surrendering.
e) US vs Axis Alliance(Betrays US due to racism)
f) Alliance win, USSR is the main super power while people still supporting Communism. British almost completely wiped out. US is divided into territories for multiple countries of control.
g) Japanese alliances vs rest of the world using millions of conquered Asian men conscription(mostly Chinese puppets).
#14 Shit forgot about India, but they are merely concentrated in Asia. Without Naval support they might end up rebelling against British and break free to form their own country except when Japan invades. US is going to either choose to help Japan or go against her. Read
Indian Collaboration with Axis. India would not have actually stuck with the British if US joined the Axis. They might rebel against British and help US.
This is the problem with Japan, they keep stabbing allies in the back. They are the tricky ones.