It is the federal principal or system of government.
The Tigris is 1,750 km long, rising in the Taurus Mountains of eastern Turkey about 25 km southeast of the city of Elazig and about 30 km from the headwaters of the Euphrates. The river then flows for 400 km through Turkish territory before becoming the border between Syria and Turkey.
The answer that completes the statement above is this: <span>became more isolated from the world of work. This changes in the middle-class American family has been greatly influenced by the rise of cities and industries which made great changes in all aspects of the American society. The middle-class American Family concentrated more on the business aspect rather than on the working aspect.</span>
