How do historians learn about people who lived in the earliest historical eras?

How w.e.b. dubois wanted to improve the social and economic situation that existed for african americans during the early 19th century?

Explain the reasons for u.s. neutrality during the 1920s and 1930s. how did ideas about neutrality change during the period from the end of world war i to the passage of the lend-lease act? be sure to include any events, terms, or people that may support your response.

Aclaim about history is most likely not valid if it has which of these characteristics?