Why is the great wall of China needed

The Great Wall of China was built as a military defensive line to defend the invasions from some northern nomadic nations.

Explanation:

Apart from the function of defense, the wall also boosted the economy, as well as promoted the culture exchange and national integration of different nations at its two sides.

`stare decisis is a legal doctrine that obligates courts to follow historical cases when making a ruling on a similar current or future case. stare decisis ensures that cases with identical facts be approached in the same way, unless overruled by the same court or a higher court such as the us supreme court. simply put, it binds courts to follow legal precedents set by previous decisions.

stare decisis is a latin term meaning "to stand by that which is decided".