<span>Sumerian civilizations were in Mesopotamia. They used agriculture to grow grain and crops. They used scripts for the writing of early texts. They used tools similar to modern counterparts and crafted pottery. Their religious beliefs were based on many Gods that had a human form, similar to those of the Greeks and Romans.</span>
Factors leading to World War II included the Great Depression, rise of Authoritarian governments, aggression by Germany, Italy and Japan and the German invasion of Poland. The one that did not lead to WWII was the strength of the League of Nations!