Describe the impact of the region the Greeks called Mesopotamia Valley of Western Civilization. How their religions, trade, and inventions helped to mold out world today. Describe the impacts the Greeks had on Weatern Civilization. How their government, philosophy, trade, and inventions helped to mold our world today. Describe the impact the art, literature, and science of the Hellenistic World had on society today. How was Alexander able to build such a large empire and maintain order, and how did he change lives of the people he conquered.