What event increased international support for the creation of a Jewish national homeland in Palestine?

The Balfour Declaration of 1917 significantly increased international support for the creation of a Jewish national homeland in Palestine. Issued by the British government, it expressed support for the establishment of a "national home for the Jewish people" in Palestine, which was then under Ottoman rule. This declaration garnered enthusiasm among Zionist leaders and communities worldwide, leading to increased Jewish Immigration to the region and heightened diplomatic efforts to support Jewish aspirations in Palestine.