The 1948 Arab–Israeli War, or the Israeli War of Independence, was fought between the newly declared State of Israel and a military coalition of Arab states over the control of former British Palestine, forming the second and final stage of the 1947–49 Palestine war. It is also known as the First Arab–Israeli War.
There had been tension and conflict between the Arabs and the Jews, and between each of them and the British forces, ever since the 1917 Balfour Declaration and the 1920 creation of the British Mandate of Palestine. British policies dissatisfied both Arabs and Jews. The Arabs' opposition developed into the 1936–1939 Arab revolt in Palestine, while the Jewish resistance developed into the Jewish insurgency in Palestine(1944–1947). In 1947 these ongoing tensions erupted into civil war, following the 29 November 1947 adoption of the United Nations Partition Plan for Palestine, which planned to divide Palestine into three areas: an Arab state, a Jewish state and the Special International Regime for the cities of Jerusalem and Bethlehem. (more on Wiki HERE)