a major regional power, partly fueled by his monopolization of the cotton and olive oil trade from Palestine to Europe. Acre's regional dominance was further elevated under Zahir's successor Ahmad Pasha al-Jazzar at the expense of Damascus. In 1830, on the eve of Muhammad Ali's invasion, the Porte transferred control of the sanjaks of Jerusalem and Nablus to Abdullah Pasha, the governor of Acre. According to Silverburg, in regional and cultural terms this move was important for creating an Arab Palestine detached from greater Syria (bilad al-Sham). According to Pappe, it was an attempt to reinforce the Syrian front in face of Muhammad Ali's invasion. Two years later, Palestine was conquered by Muhammad Ali's Egypt, but Egyptian rule was challenged in 1834 by a countrywide popular uprising against conscription and other measures considered intrusive by the population. Its suppression devastated many of Palestine's villages and major towns. In 1840, Britain intervened and returned control of the Levant to the Ottomans in return for further capitulations. The death of Aqil Agha marked the last local challenge to Ottoman centralization in Palestine, and beginning in the 1860s, Palestine underwent an acceleration in its socio-economic development, due to its incorporation into the global, and particularly European, economic pattern of growth. The beneficiaries of this process were Arabic-speaking Muslims and Christians who emerged as a new layer within the Arab elite. From 1880 large-scale Jewish immigration began, almost entirely from Europe, based on an explicitly Zionist ideology. There was also a revival of the Hebrew language and culture. Christian Zionism in the United Kingdom preceded its spread within the Jewish community. The government of Great Britain publicly supported it during World War I with the Balfour Declaration of 1917. British mandate and partition The British began their Sinai and Palestine Campaign in 1915. The war reached southern Palestine in 1917, progressing to Gaza and around Jerusalem by the end of the year. The British secured Jerusalem in December 1917. They moved into the Jordan valley in 1918 and a campaign by the Entente into northern Palestine led to victory at Megiddo in September. The British were formally awarded the mandate to govern the region in 1922. The non-Jewish Palestinians revolted in 1920, 1929, and 1936. In 1947, following World War II and The Holocaust, the British Government announced its desire to terminate the Mandate, and the United Nations General Assembly adopted in November 1947