I believe that the <u><em>SIMILARITIES </em></u>between Egypt and the civilizations of Mesopotamia are:
Both civilizations born and thrive in the desert
Both used the rivers floods to supply their cities and allow agriculture.
Both civilizations were polytheists
In the case of <u><em>DIFFERENCES</em></u>, we can list the following:
While Egypt was a unified empire, in the civilizations of Mesopotamia we had a group of cities, independent and with their own government system, very similar to what happened in Greece.
When it comes rulers, in Egypt the Pharaoh was considered a god and was worshiped alike, while in Mesopotamia, despite the religious feature of their kings, they were not worshiped.
Despite their religious system was similar (both systems were polytheists), Egypt we had anthropomorphic deities while in Mesopotamia gods were humans.
After Germany surrendered to sign,the Allied Nations signed as well HOWEVER America turned against the Treaty of Versailles and this chose not to sign. A few other countries signed as well, but those were the main.