LOL!!! Not a chance. Number one...neither the Germans nor the Japanese could possibly have mounted an across-ocean effort capable of successfully invading and occupying North America. Not in their wildest dreams could they have done it! They didn't have the industrial might. They didn't have the manpower. They would never have had the chance to divide up the USA between themselves.

Furthermore, they would have had a falling out long before that, I'm sure...

The Germans might have won the war in Europe, and they might have defeated Russia, specially if the Japanese had made a major effort against the Soviets from the East while the Germans fought them in the West. In that case, the German and Japanese spheres of influence would have most likely collided somewhere in the vicinity of central Siberia or India...and they would have ended up fighting each other there not long after. The USA would have stood aside and watched, while it armed itself to the teeth and built up its forces.

However, I suppose as pure fantasy a German-Japanese takeover of America makes an interesting story.