Why did adolf hitler lose world war 2?

It was inevitable. He probably could have defeated England if he hadn't taken on Russia as well. England was at the end of it's Empire, and was economically crushed by the Great Depression. Communist Russians wanted nothing to do with war with Hitler until he attacked. America only entered because of Pearl Harbor, and wouldn't have if Germany hadn't allied with Japan. What Germany had was high quality production. What ultimately beat them wasn't English high quality production (which was every bit as high quality as Germany) or even the mes of Russians, but American low quality, high volume industry. One Panzer could easily take out one Sherman Tank, but not the 10-1 odds they constantly faced on the battlefront after the US entered the war.