Approximately 900,000 Jews migrated, fled, or were expelled from Muslim-majority countries throughout Africa and Asia in the 20th century, primarily as a consequence of the establishment of the State of Israel. Large-scale migrations were also organized, sponsored, and facilitated by Zionist organizations such as Mossad LeAliyah Bet, the Jewish Agency, and the Hebrew Immigrant Aid Society. The mass movement mainly transpired from 1948 to the early 1970s, with one final exodus of Iranian Jews occurring shortly after the Islamic Revolution in 1979–1980. An estimated 650,000 (72%) of these Jews resettled in Israel.
A number of small-scale Jewish migrations began across the Middle East in the early 20th century, with the only substantial aliyot (Jewish immigrations to the Land of Israel) coming from Yemen and Syria. Few Jews from Muslim countries immigrated during the British Mandate for Palestine. Prior to Israel's independence in 1948, approximately 800,000 Jews were living on lands that now make up the Arab world. Of these, just under two-thirds lived in the French- and Italian-controlled regions of North Africa, 15–20% lived in the Kingdom of Iraq, approximately 10% lived in the Kingdom of Egypt, and approximately 7% lived in the Aden Colony, Aden Protectorate and the Kingdom of Yemen. A further 200,000 Jews lived in the Imperial State of Iran and the Republic of Turkey. The first large-scale exoduses took place in the late 1940s and early 1950s, primarily from Iraq, Yemen, and Libya. In these cases, over 90% of the Jewish population left, leaving their assets and properties behind. Between 1948 and 1951, 250,000 Jews immigrated to Israel from Arab countries. In response, the Israeli government implemented policies to accommodate 600,000 immigrants over four years, doubling the country's Jewish population. Reactions in the Knesset were mixed; in addition to some Israeli officials, there were those within the Jewish Agency who opposed promoting a large-scale emigration movement among Jews whose lives were not in immediate danger.
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