March 31
1146 – Bernard of Clairvaux preaches his famous sermon in a field at Vézelay, urging the necessity of a Second Crusade. Louis VII is present, and joins the Crusade. 1651 – Great earthquake at Cuzco, Peru 1850 – US population hits 23,191,876 1861 – Confederacy takes over mint at New Orleans 1870 – First black...