6. More than one-and-twenty centuries have rolled since then over the immense valley so well named Mesopotamia--"the Land between the Rivers,"--and each brought to it more changes, more wars, more disasters, with rare intervals of rest and prosperity. Its position between the East and the West, on the very high-road of marching armies and wandering tribes, has always made it one of the great battle grounds of the world. About one thousand years after Alexander's rapid invasion and short-lived conquest, the Arabs overran the country, and settled there, bringing with them a new civilization and the new religion given them by their prophet Mohammed, which they thought it their mission to carry, by force of word or sword, to the bounds of the earth. They even founded there one of the principal seats of their sovereignty, and Baghdad yielded not greatly in magnificence and power to Babylon of old. 7. Order, laws, and learning now flourished for a few hundred years, when new hordes of barbarous people came pouring in from the East, and one of them, the Turks, at last established itself in the land and stayed. They rule there now. The valley of the Tigris and Euphrates is a province of the Ottoman or Turkish Empire, which has its capital in Constantinople; it is governed by pashas, officials sent by the Turkish government, or the "Sublime Porte," as it is usually called, and the ignorant, oppressive, grinding treatment to which it has now been subjected for several hundred years has reduced it to the lowest depth of desolation. Its wealth is exhausted, its industry destroyed, its prosperous cities have disappeared or dwindled into insignificance. Even Mossul, built by the Arabs on the right bank of the Tigris, opposite the spot where Nineveh once stood, one of their finest cities, famous for the manufacturing of the delicate cotton tissue to which it gave its name--(_muslin_, _mousseline_)--would have lost all importance, had it not the honor to be the chief town of a Turkish district and to harbor a pasha. And Baghdad, although still the capital of the whole province, is scarcely more than the shadow of her former glorious self; and her looms no longer supply the markets of the world with wonderful shawls and carpets, and gold and silver tissues of marvellous designs.