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.
The answer is D, a writing system
I'd say its A, because after wars things start to decline.
I hope this is right and helped you out.
Answer:
2. Germany continued making aggressive demands
Explanation:
Britain and France declared war on Germany on 3 September 1939, two days after the German invasion of Poland. The guarantees given to Poland by Britain and France marked the end of the policy of appeasement.