ONE OF THE WONDERS OF THE WORLD OF ANCIENT ENGINEERING

Here I bring you from China its great wall, considered one of the wonders of the world, was created to arrest the invading oppressors, imagine the amount of the army to guard day and night, in each position, the material used by those people were, with bricks and carved stones, was a mixture of clay and mud compressed in the sixteenth and seventeenth centuries. That's why I say pure engineering, the length of the wall was called the Ten Thousand Li Wall, we can refer to the daily burning work in the 16th and 17th centuries, meandering 6400 kilometers or 4000 miles wide to the north of China.

Many Chinese dynasty contributed their grain of sand, but more with the initiative was the Ming in 1406, I only imagine the horses running along the length and narrow of the wall to warn the presence of the enemy, the signal of fire I do not know but He arrived to Beijing, Emperor Chu Yuan Chang. The shining mind of the wall, the most ironic of Chinese life was very harassed by Mongols and other nomads, but they were a few thousand and China had a few million subjects, but they were not as advanced as the Mongols, there was an occasion that With the knowledge of the gunpowder of the Chinese, the Mongols designed a kind of cannon, in which he managed to demolish several fragments of the walls so the soldier Vivian on the walls, was also present. The first emperor, Qin Shihuang di (221-210 BC), built a line of fortifications that linked those raised by previous states and spanned the entire border, so I tell them along the way of time there were many dynasties, which still persists. legacy, like others that were superb, many slaves form as material for the wall, diplomacy also persisted as the case of the Han dynasty tried to control the barbarians through bribes, but nothing was done to take the Chinese empire.

Genghis Khan, was the Mongol leader with the desire to dominate China, organized the majority of Chinese tribes defended as he could and if he succeeded with the wall, but lost some segments and part of the silk route that was very commercial, for the grandson of Genghis Khan, Kublai Khan, who besides being kan of the Mongols founded a new dynasty, that of the Yuan. But it did not last long for a revolt, well I tell you that it was very capricious but they succeeded, the Ming, carried out an aggressive campaign of attacks on the steppe with the objective, first, to prevent any attempt by the Yuan refugees to recover their lost throne.

That is why I say that we have to take into account that the Chinese soldiers who were stationed in the Great Wall lived in very harsh conditions, years, months without seeing their family and there was another guard in case there were deserters, or that they had to be forced by the Emperor In his position, I say that China tired of so much palliating that it always negotiated with its attackers, until they gave them territory to market them.

The Ming dynasty weakened because it was centered with the Mongols but had another enemy and took advantage of the situation, the Manchu overthrew the Ming in 1644. Built more than 2,500 years ago, in history classes told us that the Great Wall of China measured more 8,000 kilometers long, but the latest studies conducted by great scientists and archaeologists found that it measures 21,196 kilometers.

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