The rebellion itself had lasted until March 1939, when it was finally quelled by British troops. It forced Britain to make substantial concessions to Arab demands. Jewish immigration was to continue but under restrictions, with a quota of 75,000 places spread out over the following five years. On the expiry of this period further Jewish immigration would depend on Arab consent. Besides local unrest, another key factor in bringing about a decisive change in British policy was Nazi Germany's preparations for a European war, which would develop into a worldwide conflict. In British strategic thinking, securing the loyalty and support of the Arab world assumed an importance of some urgency.