The original purpose of the Great Wall was to prevent foreign invaders from breaching Chinese boundaries. Nomadic warriors often stole crops and animals from peasants living near the northern border. Sometimes they would capture Chinese citizens and force them into slavery. Soldiers stationed along the wall spotted potential dangers, allowing people to find shelter or prepare for battle. Over time, other rulers added new sections to protect valuable trade routes like the famous Silk Road. Construction on the newer parts of the wall was completed under the Ming Dynasty in the 1600s. Though most of the current wall is just a few hundred years old, experts estimate that older portions are more than 1,700 years old.
According to the passage, the Great Wall was built to prevent foreign invaders from breaching Chinese boundaries. Based on this information, you can tell that the Chinese

There are over 7,000 lookout towers that are part of the Great Wall.

Today the walls continue to erode, however historians are trying to protect what sections they can.

The height and width of the wall varies over its length. The current wall built by the Ming Dynasty averages around 33 feet tall and 15 feet wide.

It is the longest man made structure in the world.

Wide moats were often dug outside the wall in flat areas to make an enemies approach more difficult.

Smoke signals were used to indicate an attack. The more enemies that were attacking, the more smoke signals they would make.

It was named one of the New Seven Wonders of the World.

Many people say that the Great Wall can be seen from the Moon without aid. However, this is just a myth.

The wheelbarrow, which the Chinese invented, no doubt was a great help in building much of the wall.

The wall extends through all sorts of terrain, even into the mountains. Its highest point is over 5,000 feet above sea level.

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this quote could be referring to the death penalty. it's questioning the morality of sentencing murderers to death as a punishment, because it seems hypocritical. this quote seems to be arguing for non-lethal punishment for killers.