The Balfour Declaration, issued on November 2, 1917, was a British commitment to support the establishment of a Jewish national home in Palestine. Sent by Foreign Secretary Arthur Balfour to Lord Rothschild, it was later incorporated into the League of Nations Mandate. Influenced by Zionist advocates and wartime strategy, the declaration set the stage for significant political and demographic changes in Palestine, ultimately contributing to the creation of the State of Israel in 1948.