In the following years, the Zionist enterprise progressed very slowly, but from 1932 onwards, and especially between 1933 and 1935, aliyah moved into top gear. Thus from a small minority, the Jewish Yishuv in Eretz Israel became almost one-third of the population, with a developed economy and a society showing increasing signs of becoming a state. The Arabs of Palestine tried to prevent the expansion and strengthening of the Yishuv. To this end they initiated a series of violent incidents that very quickly deteriorated into riots and an Arab Rebellion that went on for three years (1936-39).