The Fifteenth Amendment ensured that what right could not be denied due to "race, color, or previous condition of servitude"?

the right to vote

Explanation:

workers of lowell mills were greatly benefited for the waltham type of work which was more a paternalist kind, trying to protect the integrity of this little girls coming from small farmers and providing an adequate place of work, this in an effort to avoid the issues of bad place conditions and immorality that the people in bigger industrialized cities of great britain were experimenting.

eroupe is a great mideval place and alot of wars went on alao