Public holidays, in addition to the U.S. federal holidays, are: Three Kings Day (Jan. 6); Transfer Day (commemorates Denmark's 1917 sale of the territory to the United States, Mar. 31); Holy Thursday and Good Friday; Emancipation Day (when slavery was abolished in the Danish West Indies in 1848, July 3); Columbus Day and USVI-Puerto Rico Friendship Day (always on Columbus Day weekend); and Liberty Day (honoring David Hamilton Jackson, who secured freedom of the press and assembly from King Christian X of Denmark, Nov. 1).