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With whose support, Jews began to move into Palestine on a large scale?

With the support of Britain, Jews began to move into Palestine on a large scale, especially after the Bev Declaration and the announcement of the British Mandate, the number of Jewish immigrants in Palestine doubled. According to statistics, in April of 19 17, the number of Jews in Palestine did not exceed 50,000, and in June of 1939, it soared to more than 445,000, accounting for13 of the total number of Palestinian residents.