
The Great Wall was first built as a defense line against nomadic incursions. Its military and strategic importance was unmatched by any other projects in ancient China. The construction of the wall began around the 7th-4th century BC during the Spring and Autumn Period (770-476BC). At that time, feudal states built walls for self-defense against the invasion of nomadic tribes. In 221 BC, after unifying China, Qinshihuang, the first emperor of China, had the walls linked up, reinforced and extended to form the Great Wall. During succeeding dynasties in later years, renovations were made in line with local geographic conditions, creating many enchanting sights. It was listed by UNESCO as its World Heritage in 1987.
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