If the United States joins Axis powers, world situation can be changed because of this, but a World War II that I think to won't say like everybody 4 big Axis powers divided up the world directly, this is not actual.
Above all, if the United States is Axis powers, he needs impossible seek far and neglect what lies close at hand runs to Ou Ya to grab territory under one's control, he the first what should hit is Mexico and Canada, although Mexico is small, but the United States wants to be hit it is so easy to also be done not have, canadian land is extensive, want completely occupational also need time, want to know, if the United States joins Axis powers, einstein won't help the United States, the United States won't have atom bomb, the country such as flower law does not have American support, germany is hit the meeting is a lot of more relaxed, also won't have energetically the motivation of atom bomb of research and development. Because this atom bomb won't appear very likely on this world, and without atom bomb weapon of this conclusive strategy, american annex Canada and Mexico at least 5 years of above, next the United States continues south below, march South America, want a flower 10 years again at least. Battlefield of time Ou Ya sees reason basically also.
For Europe, italy actually OK and temporary oversight, germany is relaxed the country such as annex France Poland, continue to attack England, assist without the United States, england falls into enemy hands very likely, next Germany attacks Russia later, do not pass or had not hit very likely as before, but land without Normandy, germany becomes European overlord very likely from now on.
Seeing an Asia, japan won't have the fight of pearl island, all military strength throw Asian battlefield, seek hegemony because of Germany Europe, russia is main cautionary Europe battlefield, assist China without strength to spare, although because this can be taken completely,Japan won't issue China, but war of resistance against aggression procrastinates 8 years still is completely possible. Because Axis powers Europe and America battlefield are obtained greatly,get the better of completely, although Japan takes no less than China to also won't surrender, pull the United States to clean America ground, the god declines the Japan of force exhaust has had aggressive battle feebly, the United States takes over Chinese battlefield naturally, nevertheless the United States also won't dispatch troops in a large-scale, resemble giving aid to nowadays Japan is same, give aid to a Jiang Jieshi political power is the largest possibility, because attach most importance to a play to still be from the back, the United States uses up actual strength impossibly for China.
So what is the grand opera? The answer is oil, heart beauty is the oil of middle east next, so two big Axis powers form the situation like battle of beautiful Su Leng very likely, just changed goodness just, live in Russia crack, likelihood and India become nonaligned state euqally, just compare India strong much just. Develop next today, because time of World War II is lengthened, atom bomb is very possible also just appear 10 years after World War II ends, all sorts of science and technology are invented from the back also take advantage of an opportunity defers ten years or so.
Overall for if the United States is Axis powers at that time, asian domain change won't be too big that nowadays, it is North America may have the United States only only, european most territory also masters in German hand.