On November 2, 1917, Arthur Balfour, the British foreign secretary, signed a letter to Lord Lionel Walter Rothschild that set out his government's support for a national home for the Jewish people in Palestine. The short note became one of the most cited documents in modern Middle Eastern history.
Britain then held Palestine as a war aim and would take it from Ottoman control weeks later. The declaration was meant to win support from Jewish communities at a moment when the outcome of the war was still uncertain.
The war was undecided. The text was careful. The promise was qualified.
The letter said nothing about borders and added that the rights of existing non-Jewish communities should not be prejudiced, a clause that later readers would weigh against the pledge itself, and the wording was drafted after debate inside the cabinet where ministers balanced wartime need against the claims of Arab allies who had also been promised things in the same region.
The document was included in the British mandate over Palestine after the war and shaped the talks that followed for decades. Its few lines still appear in court cases, textbooks, and speeches as the point where a great power put its name to a contest that has not been settled since.