Although he continued the expansion in eastern Persia and Africa west of Egypt, the conquests came to a halt in roughly the later part of his reign. The influx of spoils ceased, and the economic issues that had previously been ignored by the conquest tribesmen due to incoming revenue started coming to the fore. This was coupled with the dislike of the Arab nomads for the central authority which had hitherto been superseded by the continued war effort. The continued migration of tribes from Arabia to the conquered territories also resulted in reduced payments from the revenue of the lands, which led to resentment in the old settlers. Uthman's interference in the provincial affairs, that consisted of his declaration of the crown lands of Iraq as the state assets, and his demand that provincial surplus be forwarded to the caliph in Medina, brought about widespread opposition to his rule, especially from Iraq and Egypt, where majority of the conquest armies had settled. The old settlers also saw their status threatened by the land grants in conquered territories to prominent Quraysh like Talha ibn Ubayd Allah and Zubayr ibn al-Awwam and the caliph allowing late arriving tribal chiefs, such as Ash'ath ibn Qays, to acquire lands there in exchange for their lands in Arabia.