nationalism, militarism, Imperialism and the alliance system
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The lead-lease act was implemented in 1941 as a way to help during World War 2. The act allowed the United States to lend aid to the allies.
The military helped to make the first world war break out and the countries who were fighting felt intimidated by them and they started another war inside of the first world war which lead to militarism being on of the causes of the outbreak.
The idea that World War 1 had religious effects is novel.
Hitler survived world war 1.
In September 1939, Germany and Slovakia invaded Poland. This lead to many countries declaring war.