c)free-soilers and slavery advocates
Answer:
In the late 1800s, the focus of the american federation of labor was work hours, safety, and the right to organize.
The American Federation of Labor (AFL) constituted a national federation of labor unions existing in the United States founded in Columbus, Ohio, in December 1886 by an alliance of craft unions disaffected from a national labor union known as the Knights of Labor. It was the largest union grouping in the United States for the first half of the 20th century.
Immigration to the north provided workers for production and replacements for soldiers killed or wounded.
