Causes of World War 1: Invasion of Poland. Tensions and problems with nationalism were main causes of the second world war. Countries were going through economic struggles and could easily be taken over, due to lack of strength of their government. This photo is Germany invading Poland, the spark that started it all.
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After Germany invades Poland in September, 1939, German soldiers enjoyed the public humiliation of Polish Jews. One Jew is forced to cut the beard of another under German supervision as the local population of Tomaszow Mazowiecki, Poland watches.