Machine guns. Tanks. Chemical weapons. Warplanes. Submarines. Trench coats. Wristwatches.
Thursday marks the 100th anniversary of the U.S. entry into World War I, and some of the innovations that were developed or came into wide use during the conflict are still with us today.
America entered nearly three years after the war began, joining Britain, France and Russia in the fight against Germany and the Austro-Hungarian Empire. When it ended on Nov. 11, 1918, more than 4.7 million Americans had served and some 115,000 died.
The world's first mechanized war introduced enhanced weaponry and equip...
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