There were actually four HUGE causes for WW1, treaties and alliances brought many countries into war, the imperialism of some countries scared other countries, and they were "defending" themselves, there was a lot of weapons stocking, and countries were creating gigantic armies, and that threatened other countries, and then we have plain old nationalism.
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helping is a good thing to do as I said love ur neighbors as ur self
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General William T. Sherman
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d) they inspired more african americans to join the union army
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