The presidency of Richard Nixon began at noon EST on January 20, 1969, when Richard Nixon was inaugurated as 37th President of the United States, and ended on August 9, 1974, when he resigned in the face of almost certain impeachment and removal from office, the only U.S. president ever to do so. Nixon gained the support of many white ethnic and Southern white voters who traditionally had supported the Democratic Party, but he lost ground among African American voters. Over 30,000 U.S. military personnel serving in the Vietnam War had been killed since 1961, with approximately half of those deaths occurring in 1968. Early in his first term, Nixon pressured Israel over its nuclear program, and his administration developed a peace plan in which Israel would withdraw from the territories it conquered in the Six-Day War.