It helps them determine whether an assertion made by one source is likely to be true.
Answer:
In cases where Native tribes resisted assimilation, Jefferson believed that to avoid war and probable extermination they should be forcefully relocated and sent west.
The roaring twenties were called this because this was after the US won WWII so everyone was celebrating. The US started prohibition, but people kept on drinking and partying. It got so bad and crazy that this was one for the main reasons for the Great Depression
One is the social reform movement.