History of The Great Wall of China

The history of the Great Wall of China began when fortifications built by various states during the Spring and Autumn (771-476BC)and Warring states periods (475-221 BC)were connected by the emperor of China ,Qin Shi Huang, to protect his newly found Qin dynasty (221-206 BC) against incursions by nomads from the inner Asia . The walls were built of rammed earth , constructed using forced labour , and by 212 BC ran from Gansu to the coast of southern Manchuria.
Although a useful deterrant against raids,at several points throughout its history the Great wall failed to stop enemies ,including in 1644 when the Manchu Qing marched through the gates of Shanghai Pass and replaced the most ardent of the wall building dynasty,the Ming, as the rulers of China.
The Great Wall of China visible today largely dates from the Ming dynasty ,as they rebuilt much of the wall in stone and brick,often extending its line through challenging terrain.Some sections remain good condition or have been renovated , while others have been damaged or destroyed for ideological reasons, or lost due to the ravages of time.