Following World War I, the present -day Israel and Jordan became the British mandate of Palestine, which in 1922 was divided into the mandates of Transjordan and Palestine. Transjordan gained its independence in 1946 and adopted the name of Jordan in 1950. Jordan was one of the Arab states opposed to the creation of Israel in May 1948. It took part in the warfare between the Arab states and the newly founded State of Israel. Jordan signed a mutual defense pact in May 1967 with Egypt, and it participated in the June 1967 war between Israel and the Arab states of Syria, Egypt and Iraq. No fighting occurred along the 1967 Jordan River cease-fire line during the October 1973 Arab-Israeli war, but Jordan sent a brigade to Syria to fight Israeli units on Syrian territory. In 1991, Jordan agreed, along with Syria, Lebanon, and Palestinian representatives, to participate in direct peace negotiations with Israel. Jordan signed a peace treaty with Israel in 1994, ending a 46-year official state of war, and it has since sought to remain at peace with all of its neighbors. Jordan has been a constitutional monarchy based on the constitution promulgated in January 1952. King Hussein ruled Jordan from 1953 to 1999, and King Abdallah II succeeded his father Hussein following the latter's death in February 1999. King Abdallah II moved quickly to reaffirm Jordan's peace treaty with Israel and its relations with the U.S., and has since focused the government's agenda on economic and political reforms. Jordan has few natural resources. Unlike many of the nations in the region, Jordan has no oil of its own and depends on external sources for its energy requirements. The economy depends largely on services, tourism and foreign aid. Nevertheless, Jordan’s economy has performed remarkably well in recent years supported by the implementation of sound policies and wide-ranging structural reforms.