April 7 75th Anniversary of the World Health Organization being established by the United Nations (1948)
April 13 Thomas Jefferson’s Birthday (1743)
101 Anniversary of the State of Massachusetts opening all public offices to women (1922)
April 15 Congress ratifies peace with Great Britain (1783)
April 17 51st Anniversary of the first Boston Marathon in which women are officially allowed to compete (1972)
April 18 Patriot’s Day
81st Anniversary of the Doolittle Raid on Japan (1942)
April 19 American Revolution begins (1775)
April 22 Earth Day
April 28 Arbor Day
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