The Balfour Declaration was a statement made by the British government during WW1 to gain Jewish political support for the war and financial support from the Rothschild bankers. At the time, the war was going badly for the UK and its government was worried about insolvency from its mounting war debts. The Declaration announced British support for the establishment of a "national homeland for the Jewish people" in Palestine, which was then part of the Ottoman Empire (allied with Germany).
After that war ended, Britain seized control of Palestine and encouraged Jewish immigration and land purchases. This led to escalating conflicts between existing Arab and new Jewish residents, culminating in a civil war between them in 1947. In 1948, the British abandoned their mandate over Palestine and a new Jewish state of Israel was declared. The neighboring Arab states opposed this action and invaded Palestine in the First Arab-Israeli War. Israel won that war in 1949 and increased its territory. And the beat goes on...
After that war ended, Britain seized control of Palestine and encouraged Jewish immigration and land purchases. This led to escalating conflicts between existing Arab and new Jewish residents, culminating in a civil war between them in 1947. In 1948, the British abandoned their mandate over Palestine and a new Jewish state of Israel was declared. The neighboring Arab states opposed this action and invaded Palestine in the First Arab-Israeli War. Israel won that war in 1949 and increased its territory. And the beat goes on...