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Construction of The Great Wall started in the 7th century B.C. The vassal states (under the Chou Dynasty) in the northern parts of the country, each built their own walls for defensive purposes. After many conflicts, China was united in 221 B.C. In 214 B.C. Shih Huang-Li (the first Emperor of a united China) connected a number of the existing defensive walls into a cohesive unit fortified by a system of watchtowers. These served both to guard the rampart against attack as well as to communicate with the then capital, Hsien-Yang (near Sian), by signal (smoke by day; fire at night). The principal enemy against whom the Great Wall was built were the Hsiung-Nu (the nomadic tribes of the northern steppes). The wall at this time extended more than 10,000 li or 5,000 kilometers which is the origin of the name of the 10,000-li Great Wall.
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