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J.P. Morgan formed the United States Steel Corporation by merging eight of the most prominent steel companies of the time
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Theodore Roosevelt pronounced the Roosevelt Corollary to the Monroe Doctrine, which was used to justify United States intervention in Central America during the early 1900s
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The burning down of the Triangle Shirtwaist Factory in Manhattan, New York City which resulted in the deaths of 146 workers who were unable to escape because the exits were locked
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Serbian Gavrilo Princip assassinated Austrian Archduke Franz Ferdinand and his wife Grand Duchess Sophie, an event which is considered to have triggered World War I in Europe
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Germans sank the RMS Lusitania ocean liner, killing over 100 Americans and raising outcry in the United States against Germany
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The US Congress declared war on the German Empire and officially became directly involved in World War I
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Germany signed an armistice after Kaiser Wilhelm's abdication that signaled the end of World War I
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The ratification of the 18th Amendment, which banned the manufacture and sale of alcoholic beverages in the United States
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The passage of the 19th Amendment, which granted women the right to vote and was ratified on August 18, 1920
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A violent race riot which took place in Chicago, Illinois and was characterized by high conflict, bloodshed, and arson, as well as being considered to be the worst riot of the "Red Summer" of 1919