Explanation: Japanese-Americans living on the west coast of the U.S., including California were believed to be a security threat during W.W.II. Because a Japanese invasion was feared, the internment of Japanese-American citizens was carried out.
This is because the Neolithic Revolution is when people found out that farming was a thing and then went on to start settling down in villages and farming more instead of hunting.
The caste system slowly developed as the Aryans established settlements throughout India. At first the social distinctions were the differences in complexions between the lighter skinned Aryans and the darker skinned Dravidians.
Maybe where the person got there information from. Whether the source was reliable or not. She could also see if the dates of events and citations are truly impacting your writing.