https://amgreatness.com/2021/05/18/palestine-shouldnt-exist/
At the end of World War I the Ottoman Empire had been destroyed, leaving the allies to administer its former territories in the Levant. The French received a League of Nations mandate for Lebanon, which had been Catholic since the crusades, as well as for what is now Syria. The British created new kingdoms with varying degrees of independence in Egypt, Iraq, and in Hejaz, which would be invaded by the Sauds and transformed into Saudi Arabia a few years later.
The British also received a League of Nations mandate to implement the Balfour Declaration in Palestine. As the Mandate stated, “recognition has thereby been given to the historical connection of the Jewish people with Palestine and to the grounds for reconstituting their national home in that country.”
Lord Balfour said in a speech he hoped the Arabs would not “begrudge that small notch” of land to the Jews, reminding them of the new Arab sovereignty in Hejaz, which covered 870,000 square miles. Palestine, this “small notch of land,” included Israel, Gaza, the West Bank, and all of Jordan. This territory jointly constituted about 46,000 square miles, or 5 percent of the area of Hejaz, and had a population of just a few hundred thousand, including nomadic Arabs as well as Jews who had largely arrived in the first Zionist settlement movement of the 1880s.
Unfortunately, the British had made a certain Prince Faisal, who had been an ally in the war, king of Iraq. And his brother Abdullah, who had also been a good British ally, wanted to be a king, too. He complained to the British, who duly made him a king. Their solution was to give him the largely empty Transjordan, figuring the Jews wouldn’t mind if 75 percent of their promised homeland was deleted right at the outset.
The Jews were left with about 8,000 square miles, roughly the size of New Jersey. Between the world wars, the British restricted Jewish immigration and settlement to small areas and simultaneously encouraged Arab immigration. The Arabs were vastly more influential in the region and had the innate sympathies of the British. They might have gotten away with eradicating the Jews from Palestine entirely if not for the unfortunate trick played on the Arabs by World War II: The Arabs had supported Nazis, and this made them look bad. As a result, the British felt compelled to stick to their guarantee of a Jewish homeland. To an extent.