 From 1944 onwards, the plan became the official policy of the Zionist leadership, and the immigration of Jews from Arab and Muslim countries became "explicit or implicit in all the declarations, testimonies, memoranda and demands issued by the Jewish Agency from World War ll until the establishment of the state".Ben-Gurion saw immigration as the top priority of the Zionist project, but was aware of the challenges of such a large-scale project, stating following the 1948 Arab–Israeli War