in the old world, the victory of charles Martel at Tour and Checked the Moslem advance in Europe, but the moslem forces, have besiegrd Constantinope for second time, were still strong enough to keep the Mediterranean as their private sea and at the same time to crush the Maitraka dynasty in india and drive the T,ang dynasty,s frontier guards out of Chinese Turkestan. In the Nwe World, although no one in the Old World was aware of it, a period of economic properity and cultural flwering in what are now Mexico and Guatemala was endingin disater. In the highlands of Mexico the urban center of Teotihuacan was sacked around 700 AD; in the Yucatan lowlands the classic civilization pulation.of the Maya collaosedj its ceremonial centers ceased to function, and the region lost its population