But after just a few days, the 1929 (5689) Arab riots broke out, and there was uncertainty regarding the continued development of Eretz Israel. The British were also having doubts regarding the promises made in the Balfour Declaration. In addition, an economic crisis in the United States came to a head a number of weeks later, which worsened in the years to come and prevented the flow of American-Jewish capital to the Yishuv for development purposes.