By the winter of 1941, Barbarossa had failed. By the time the Western Front was opened in 1944, Army Group South had collapsed, Army Group North was failing, and Army Group Center was in the process of being encircled. Germany had lost, it was just a question of when. In the meantime, the entire North African campaign cost the Germans less resources than the Dnieper-Carpathian Offensive.

Friendly reminder that prior to Pearl Harbour, the US was sponsoring Japan's war crimes in China. The US made up the bulk of Japan's iron, copper, oil, steel, and wheat supply... Essentials for industrializing and waging war. Even with this massive economic power backing them, Japan had been fought to a standstill by 1940. By 1944, the Nationalists were more concerned with containing the Communists than they were with containing the Japanese.

In the case of both Germany and Japan, powerhouses at the peak of their power were ground down to a stalemate against a rapidly industrializing nation.