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United States 1/9/1918 Battle of Bear Valley US troops engaged the Yaqui Indians in the Battle of Bear Valley. This was a minor incident in Arizona but, it was one of the last battles of the American Indian Wars.United States 3/19/1918 Daylight Savings Time The US Congress. with The Standard Time Act, approved time zones and the creation of Daylight Savings Time which went into effect on March 31, 1918.United States 5/2/1918 GM Acquires Chevrolet General Motors acquired the Chevrolet Motor Company of Delaware.United States 5/15/1918 Air Mail Begins The US Postal Service began Air Mail deliveries, becoming the third country to do so behind India and England. Routes were between New York City, Philadelphia and Washington DC. American President Woodrow Wilson (3/4/1913-3/4/1921) British Prime Minister David Lloyd George (12/6/1916-10/19/1922)