Adolf Hitler invaded Poland in 1939 primarily to expand German territory and secure "Lebensraum" (living space) for the German people. He despised the Polish Corridor, which divided Germany, and sought to undo the territorial losses imposed by the Treaty of Versailles. Nazi ideology also played a major role, as Hitler considered Poles and other Slavic peoples inferior and aimed to conquer and ethnically cleanse these lands. Additionally, Hitler wanted access to resources, especially oil, and believed that conquering Poland was necessary for Germany's economic and military expansion. The invasion was also facilitated by the Nazi-Soviet Pact, in which Germany and the Soviet Union agreed to divide Poland between them. Hitler underestimated the willingness of Britain and France to go to war over Poland, which led to the outbreak of World War II after they declared war on Germany following the invasion. The invasion was preceded by a staged false-flag incident to justify the attack.
In summary, Hitler invaded Poland to gain territory and resources, implement his racial ideology, and consolidate power, expecting a quick victory without major international intervention.
