Between 1956 and 1967
This period saw the rise of Nasserism; the founding of the United Arab Republic in 1958 and its collapse in 1961; Syrian plans for the diversion of water from the Jordan River; continued fedayeen raids, mostly from Syria and Jordan, and Israeli reprisals; and the increasing alignment of the Arab states with the Soviet Union, who became their largest arms supplier.
In 1964, the PLO was established by mostly Palestinian refugees mostly from Jordan. The Article 24 of the Palestinian National Charter of 1964 stated: "This Organization does not exercise any territorial sovereignty over the West Bank in the Hashemite Kingdom of Jordan, on the Gaza Strip or in the Himmah Area."
Read more about this topic: History Of The Arab–Israeli Conflict