All of the following were common sources of low-cost industrial labor in the Southern textile mills of the new South except

children.
African Americans.
recent immigrants.
American Indians.

African Americans

Explanation:

mill owners rarely hired blacks

in the 1800s, locomotives powered by steam made transportation faster and cheaper. the resulting rapid growth of railroads led to the connection of the atlantic and pacific railroad in oklahoma city in 1897.

in the last years of the century, the improvement of steam-based engines the expansion and growth of railroads. this growth increased when the companies started to build and expand, such as the atlantic and pacific railroad, which connected new mexico with california, and missouri with oklahoma. many of these new networks were built in oklahoma, and these changes transportation henceforward.