"The Balfour Declaration, issued by the British government in 1917, announced Britain's promise for a "national home for the Jewish people" in Palestine, which was then under the rule of the Ottoman Empire.
The promise appeased the Zionist movement, who believe in a Jewish right to the land of Jerusalem -- or Zion.
Following the end of World War I, the region of Palestine was conceded by the Ottoman Empire and was placed under the rule of the British via a mandate from the League of Nations."
"The United Nations later adopted a resolution to split Palestine into two independent states -- a Jewish State and an Arab State with Jerusalem under UN trusteeship, despite opposition from Palestinian Arabs of the region."
Additional background from Reuters.
https://www.reuters.com/world/middle-east/palestinians-fleeing-fighting-south-find-no-escape-danger-2023-10-15