Why did ancient egypt went into a decline?

The factors leading to the decline of ancient Egypt were largely uncontrollable. A civil war coupled with invasions by the Assyrians weakened the Egyptian military allowing the Persian empire to successfully invade and take over Egypt

Explanation:

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof

health and medicine because people are dying from not being healthy or not strong enough medicine