Two reasons egypt couldn't stop the decline of its 3000 year old civilization

The reasons for the decline of Egyptian civilization were many from among two are these:

Geographical situations: Egypt is surrounded by desert and at that time it was a difficult task to establish strong trade ties with other nations as it was difficult to travel to the place, making the trading relationships not so strong to serve for a long period of time.

Natural disasters and lack of able leaders: Pepy II was the last leader who could pull it all together even during the Nile flooding and drought. There were many who challenged the kings after him and lack of administration coupled with civil war and wide spread starvation played its role. The economic situations were destroyed ultimately resulting in the fall of a great civilization. 

tenochtitlan (also spelled tenochtitlán), located on an island near the western shore of lake texcoco in central mexico, was the capital city and religious centre of the aztec civilization. the traditional founding date of the city was 1345 ce and it remained the most important aztec centre until its destruction at the hands of the conquering spanish led by hernán cortés in 1521 ce, which led to the final collapse of the aztec empire.

to protest slavery i would think it would be a