Secondary Sources are works written about your topic AFTER they happened. They provide context, analysis , and useful facts you need to better understand and explain your primary sources.
How intersectionality in the feminist literature movement was a revolution that resulted in making it more inclusive of different narratives
Elizabeth Key Grinstead who was a mixed-race woman who went to fight for her freedom which caused a reform of slave laws making them stricter
How the Norman conquest of 1066 reformed England socially and politically.
Rock 'n' Roll Revolution and how it impacted youth culture of the fifties and how it's carried on since then.
Mother Teresa and her stance on abortion
("Mother Teresa" OR Bojaxhiu) AND abortion*
books and articles in catalog
articles in EBSCO
worth skimming, but here is a narrow selection
Books in Worldcat (there are primary sources in here too!)
Stonewall Riots
Portrayal of black women during Jim Crow era in white culture, print, music, advertising
"African American women" AND "jim crow"
of possible interest is Disfigured images : the historical assault on Afro-American women
"African American women" AND history AND (advert* OR media)