Answer:
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Explanation:
events that occurred in the 20th century that were mainly because of the wars were the fall of four major monarchies (Russian, Austrian/Hungarian, German and Turkish) and conflicts in alliances (world war 1). and a huge event that occurred in the 20th century was the great depression.
sorry i didn't include all of it, that's as much as i could remember haha, hope this helped at least a little!
