Which item is an example of secondary source

Which progressive reform was least related to the causes and effects of world war i? o legislation limiting the use of child labor o establishing 8-hour workdays for railroad workers o reducing tariffs on imported goods o expanding women's rights and the right to vote

What was martin luther king, jr., referencing in the passage that brought him to lead a protest in birmingham?

Which of the following could be described as a conservative reaction against the ideas of the jazz age