In spite of this, there was much activity in Palestine. The Yishuv's institutions, headed by the Zionist Commission and the Zionist Executive that replaced it, expanded their land acquisition activities, and from 1921 - after much argument - acquired extraordinarily large tracts of land in the Jezreel Valley. Large-scale settlement activity in the valley began, and within less than a decade, 20 new settlements had been added to the Jewish Yishuv in this valley alone.