Question

Why did the ming dynasty build the Great Wall of china

Answer 1

The Great Wall of China is the longest man-made structure in the world, stretching 21,196.18km (13,170.6956 miles) long. It was built to keep out raiding parties of nomadic tribes, such as the Mongol, Turic and Xiongnu, from modern-day Mongolia and Manchuria.

The first Emperor of China, Qin Shi Huang, is often considered the father of the Great Wall, but even before he united the nation in 221BC, individual states built walls to keep out invaders as early as the 7th Century. Qin connected, lengthened and fortified the walls to protect the northern border between 221-206BC. Subsequent dynasties, most notably the Ming, maintained and rebuilt it.

Answer 2

Because after the Ming Dynasty replaced the Yuan Dynasty, they drove out the Mongols, and pushed them to the northern grasslands. The Mongols would return here and there to harass the northern part of the Ming empire. In response to this and because they wanted protection the Great Wall of China was built. 

I hop this helps! :D