Britain and France declared war on Germany in 1939, but here, people often cite world war 2 as starting 1940 not 1939, as for months after, they didnt actually go to war just yet. Hitler had a good record at making Britain and France make threats and do nothing. He could have risked that they wouldnt attack just yet. Even if they did, he could have held them off. As much as i say Hitlers grave was dug when he attacked Russia, he originaly had lots of success. Volgograd, which i refuse to call by its then name, was close to falling to Germany. The German army had reached that city with surprising speed. Also if he had attacked earlier he might have missed the Russian winter.Libertine Seguros said:Even in 1939, beating Russia was still going to be a difficult proposition; Russia's biggest asset is that it is huge. They could have scorched earth retreated, even given up big population centres like they did to Napoleon in 1812, because that would have made the Axis supply lines longer and longer and longer, while the Russians would be able to access their food and weaponry more quickly. Plus, after Britain and France declared war following the attack on Poland, Germany would have been facing attack on the Western Front throughout, which would have hindered their plans to attack eastward. It is true that the "Lebensraum" detailed in Hitler's plans was intended to be from the east, but because the Allies declared war when he attacked Poland, he needed to see them off to protect Germany's western frontier before he could legitimately put his efforts into the eastern front. That's what the Battle of Britain was about; Hitler never wanted to take over Britain, he saw it as a potential ally. But as long as Britain was flying bombs over Germany, they would need to use large numbers of Luftwaffe on the western front to deal with that threat, thus weakening the forces available to use on the eastern front.
Perhaps his biggest mistake after all was diverting all those elite of the elite SS men, to ethnic cleansing rather than war.