April 19

April 19, 1775 - The American Revolution began on the common at Lexington, Massachusetts, with "the shot heard round the world."
For more on the American Revolution,
http://edsitement.neh.gov/view_lesson_plan.asp?id=682An American domestic terrorist’s bomb destroys the Oklahoma City federal building, killing 168 people, 99 of whom were government employees - 1995
Labor history found here:
http://www.unionist.com/today-in-labor-history & here:
http://www.workdayminnesota.org/index.php?history_9_04_19_2011