Southerners argued that slave labor was superior because

•slaves worked in many industrial areas.
•slaves actually enjoyed being property
•slaves and slaveholders depended on one another
•manumission brought shame to freed slaves.

slaves and slaveholders depended on one another

Explanation:

Southern slaveholders often used biblical passages to justify slavery. ... the South where reliance on slave labor was the foundation of their economy. ... Defenders of slavery argued that if all the slaves were freed, there would be ... on the one side and the friends of order and regulated freedom on the other. ... Manumission

overtime, the civil rights movement changed in a way that not only it benefited african-americans, but benefited other ethnicity's such as latinos, asians, or women too! that's why the results of the movement be called mixed.

the civil rights movement brought about tremendous changes. no longer were blacks denied the right to vote, to eat, shop, and swim where they , and more importantly, to attend integrated schools. despite its many accomplishments, however, the civil rights movement had its shortcomings. for example, many people, both young and old, lost their lives, homes, jobs, and families. still other individuals were so damaged by psychological trauma that they ceased being productive members of the community. the movement left intact the economic inequities that had contributed to the maintenance of segregation. and finally, racism remained alive and well long after the movement's end. like most movements of its kind, the civil rights movement left behind a mixed legacy of triumph and tragedy.

it foreshadows the theme of the paragraph and hints the topic that will be discussed in the paragraph!