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out of these options I would say either "it was protected by massive walls" but please do not just believe me because I am not sure
The Great Wall of China is the longest building on earth with a length of 13,170 miles. Made from a combination of brick, stone, wood and other materials, it was originally constructed primarily to serve as a defence against the nomadic invasions from the north that threatened Chinese states / empires.
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There were dramatic changes in women's dress during the first decade of the 20th century. ... Women's fashions changed considerably between 1900 and 1910. The fashion of 1900 was characterized by an S-shaped silhouette that was achieved mainly by a boned corset that was long and rigid in front and shorter at the rear.