John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), often referred to by his initials JFK and Jack, was an American politician who served as the 35th president of the United States from January 1961 until his assassination in November 1963. Kennedy served at the height of the Cold War, and the majority of his work as president concerned relations with the Soviet Union and Cuba. A Democrat, Kennedy represented Massachusetts in the U.S. House of Representatives and Senate prior to becoming president. Kennedy extended the first informal security guarantees to Israel in 1962 and, beginning in 1963, was the first US president to allow the sale to Israel of advanced US weaponry (the MIM-23 Hawk) as well as to provide diplomatic support for Israeli policies, which were opposed by Arab neighbors; those policies included Israel's water project on the Jordan River.