3rd » The Twin Peaks Tunnel in San Francisco, California begins service as the longest streetcar tunnel in the world at 11,920 feet (3,633 meters) long.
5th » Stephen W. Thompson shoots down a German airplane. It is the first aerial victory by the U.S. military.
5th » SS Tuscania 1914 6 is torpedoed off the coast of Ireland; it is the first ship carrying American troops to Europe to be torpedoed and sunk.
14th » The Soviet Union adopts the Gregorian calendar (on 1 February according to the Julian calendar).
16th » The Council of Lithuania unanimously adopts the Act of Independence of Lithuania named Act of Independence, declaring Lithuania an independent state.
21st » The last Carolina Parakeet dies in captivity at the Cincinnati Zoo.
23rd » Last monarch of Mecklenburg-Strelitz commits suicide.