<span>Because, of the mixture of ethnic groups in the land. Control of land and ethnic groups moved back and forth between these empires.</span>
<span>The Wall served to prevent the massive </span>emigration and defection<span> that had marked East Germany and the communist Eastern Bloc during the post-World War 2 period.</span>
The Muslims faith benefited the entire region during their golden age when the Sufi missionaries spread Islam which brought messages to different regions around the world. Some of the principal locations were Ancient Mesopotamia, Persia, North Africa, and Central Asia.
The medieval guilds were generally one of two types: merchant guilds or craft guilds. Merchant guilds were associations of all or most of the merchants in a particular town or city; these men might be local or long-distance traders, wholesale or retail sellers, and might deal in various categories of goods.
