the civil war started in April 12, 1861 and ended in April 9, 1865. the cause of the civil war was because the north was not tolerating slavery as being in our country (United States of America) and so they came with the solution of the civil war
The amendment process was included in order to ensure that the Constitution did not become weak. This prevented any corruption or loopholes in the amendment process, keeping it from becoming something like the Articles of Confederation. Hope this helps and let me know if you have more questions!
Answer:
I believe it would most likely be because of a drought, flood, and/or temperature changes. Climate change also affects the food supply, meaning they were nomads and just trying to find food.
Hope this helps! God bless!