Wikipedia:Selected anniversaries/March 7

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 * 321 – Emperor Constantine I decreed that Sunday, the day honoring the sun god Sol Invictus (disc pictured), would be the Roman day of rest.
 * 1277 – Bishop Étienne Tempier promulgated a condemnation of 219 heretical propositions that were being discussed at the University of Paris.
 * 1814 – War of the Sixth Coalition: Napoleon's army forced Mikhail Semyonovich Vorontsov's Russian troops to withdraw from the Chemin des Dames, but French casualties exceeded Russian losses.
 * 1850 – United States senator Daniel Webster delivered a speech advocating compromise on slavery, which proved to be unpopular with abolitionists in his home state.
 * 1900 – The German ocean liner SS Kaiser Wilhelm der Grosse became the first ship to send a wireless telegraph message to an onshore receiver.
 * 1936 – Nazi German forces re-occupied the demilitarized Rhineland, violating both the Treaty of Versailles and the Locarno Treaties that were signed after World War I.
 * 1945 – World War II: At the beginning of the Battle of Remagen, Allied forces unexpectedly captured the Ludendorff Bridge, which possibly hastened the war's conclusion.
 * 1968 – Vietnam War: The United States and South Vietnam began Operation Truong Cong Dinh to sweep the area surrounding the Mekong Delta town of Mỹ Tho to root out Viet Cong forces in the area.
 * 1985 – The charity single "We Are the World" by the supergroup USA for Africa was released, and went on to sell more than 20 million copies.
 * 2009 – The Kepler space telescope (depicted), designed to discover Earth-like planets orbiting other stars, was launched.
 * 2009 – Dissident Irish republican campaign: Two off-duty British Army soldiers were shot dead by Real IRA paramilitaries outside Massereene Barracks in Antrim, Northern Ireland.
 * Born/died: | Heraclianus |d|413| Ewald Christian von Kleist |b|1715| Boris Kustodiev |b|1878| Harriet Jacobs |d|1897| Tom Acker |b|1930| Viv Richards |b|1952| Nicolas Dupont-Aignan |b|1961| Cool Papa Bell |d|1991