Years ago, in 221, the Qin Dynasty began building The Great Wall of China. The purpose of this wall is to protect Northern China from the invaders farther north. The Han and Ming dynasties have continued to build the wall which is now more than 31,000 miles long.
"Great Wall of China." TravelChinaGuide.com n. pag. Web. 25 Jan 2011. <http://www.travelchinaguide.com/china_great_wall/>.
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