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The Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials
The idea of a single, unified wall to protect China from invaders began when Qin Shi Huang, the first Emperor of China (221–206 BC) connected various fortifications built between the 8th and 3rd centuries. Construction continued through 1878, meaning that, including the original fortifications, the wall was under construction for over 2,600 years.