It was just one of the MANY reasons that resulted in the 2nd WW. Maybe if they hadn't been so harsh towards Germany and blamed them for the cause of WW1 then the 2nd one most likely wouldn't have happened.
Answer: A. drought
Explanation:
It is A because their environment changed alot so it was difficult to grow corn and so the migrated south where it rained more.
They followed the seasonal grazing and migration of buffalo because they survived on hunting. This was because the ground was not fertile enough for long-term crops and like today, there were tornadoes.
Answer:
Ziggurats were built on high platforms to keep them safe from floods,
And Much of life in a Sumerian city centered on the ziggurat.