Weizmann was an important figure in the negotiations with the British government that led to the Balfour Declaration of 1917, supporting the idea of a Jewish  national home  in Palestine that also respected the rights of existing non-Jewish people already living there.
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Weizmann was part of the negotiations that resulted in the creation of the Balfour Declaration of 1917.
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The Balfour Declaration rejected the idea of a Jewish national home in Palestine.