Eliminator Sticky Notes Pencil What was the PRIMARY effect of increased racial tensions during the 1920s?
A resurgence of the Ku Klux Klan
Ratification of a prohibition amendment
Movement of white families to urban centers
Passage of legislation ending Jim Crow​

currancy

explanation:

i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.