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President William McKinley wins his second term as president, this time with Theodore Roosevelt in the second spot on the ticket, again defeating William J. Bryan by an Electoral Margin of 292 to 155.
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Theodore Roosevelt wins his first election for President after serving three years in the office due to the death of William McKinley. He defeats Democratic candidate Alton B. Parker, 336 to 140 in the Electoral College vote.
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The first successful field tractor is invented by American Benjamin Holt, using a caterpillar track to spread the weight in heavy agricultural machinery.
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President Theodore Roosevelt is inaugurated for his second term.
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The first moving assembly line is introduced and adopted for mass production by the Ford Motor Company, allowing automobile construction time to decrease by almost 10 hours per vehicle.
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The United States Coast Guard is established, replacing the responsibilities formerly entailed within the services and stations of the U.S. Life-Saving Services.
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The British ship Lusitania is sunk by a German U-boat submarine, causing 128 American passengers to be lost. Germany, although it warned of the pending crises to passengers, issued an apology to the United States and promised payments.
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Four days after receiving the request from President Woodrow Wilson, the United States Congress declares war on Germany and join the allies in World War I.
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December 18, 1917 - The 18th Amendment, advocating prohibition of alcoholic beverages throughout the United States, is sent to the states for passage by the United States Congress.
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The influenza epidemic Spanish flu spans the globe, killing over twenty million worldwide and five hundred and forty-eight thousand people in the United States.
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During World War 1, British forces crush the Ottomans at the Battle of Megiddo.
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The Treaty of Versailles is signed, ending World War I.
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Women are given the right to vote when the 19th Amendment to the United States constitution grants universal women's suffrage. Also known as the Susan B. Anthony amendment, in recognition of her important campaign to win the right to vote.