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Since then, the Great Wall was rebuilt, modified or extended throughout Chinese history for over 2,000 years by millions of Chinese people drafted in for the task. The primary purpose was always to protect the Chinese Empire from the Mongolians and other invaders. Most of the Great Wall we see today was built in the Ming Dynasty (1368-1644). In some areas, two walls built in two different dynasties can be seen running side by side.
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The great wall was build by several Emperors over a long period of time. It it believe to have started in the 7th C BC. It was then further fortified between 5th C BC to 221BC by the states of Qi, Yan and Zhao. It was then extend by the first Emperor Qin in ca 221 BC. Down through the years other dynasties have build extensions else include Han, Sui, Northern, Jin, Ming and Qing.

hope helped u dear friend..! :D
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mark it as the best answer if i heped u... ^_^
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