She was about to enter a war and decided that the Arabs would make a better ally due them having control over the oil plains. Both promises made were overlooked by the UN when the partition was suggested in 1948.
In its history Israel has been involved in 5 wars. The cycle of conflict continues after the wars due to terrorism, suicide has become very popular in the last few decades. Israel is now contemplating a huge wall to be constructed to contain the west bank and its people to stop possible future attacks. Since the state was created in 1948 it has been effectively at war with the Arabs, though not constantly in battle, the threat is constant and so both sides build up their defences and offences in anticipation, also to warn off the other. When it was created by the UN, the Arabs rejected Israel's right to exist, immediately launching an attack. During her infancy in 1948 through to 1949, Israel expanded her territory, taking advantage of the wars and using them as an excuse to take land from the Arabs. The Arabs were again defeated in 1956, again in 1967. In 1973 the fortune of the Arabs changed and they won back respect when they attacked Israel during a Jewish holiday, the state of Lebanon was destroyed as a result. In 1982 Israel launched a pre-emptive strike on the Arab states, fearing they might attack as they were building up their forces. The Arabs were not strong enough to retaliate; their forcers were destroyed. .
The consequences of the 1967 war are still preventing peace today. Israel took a lot of Arab territory in the war. During the six days of fighting Israel captured Sinai, the West Bank, the Gaza strip, Golan Heights and East Jerusalem. The territories gained were Arab and had been given to the Arabs by the UN as part of the divide in 1948. The newly acquired territories are under military control even with the large hostile Arab population. The Jewish state has compensated for this by enforcing a law whereby ever Israeli has to do at least one year military service.