The subsequent empires of the Ummayyads, Abbasids, the Mughals, and the Seljuk Turk, Safavid Persia and Ottomans were among the largest and most powerful in the world. The peoples of the Islamic world gave rise to many centers of culture and science and produced notable scientists, astronomers, mathematicians, doctors, nurses and philosophers during the Golden Age of Islam. Technology flourished; there was much investment in economic infrastructure, such as irrigation systems and canals; stress on the importance of reading the Qur'an produced a comparatively high level of literacy in the general populace.
In the 18th and 19th centuries A.D., Islamic regions fell under the sway of European imperial powers. Following World War I, the remnants of the Ottoman empire were parcelled out as European protectorates. Since then, there has been no major widely-accepted claim to the caliphate (which had been last claimed by the Ottomans).