Final answer:
African American men were the key allies for prominent advocates of women's suffrage after the passage of the 15th Amendment.
Explanation:
Following the passage of the 15th Amendment, the most prominent advocates for women's suffrage formed an alliance with African American men. Despite racial divides, black and white women came together through organizations like the National Association of Colored Women's Clubs to secure the 19th Amendment granting women the right to vote in 1920. The alliance was crucial for the suffrage movement's success.
Learn more about women's suffrage movement here:
https://brainly.com/question/39711919
