Why might recent events have led to many African Americans working for ranchers?

During the Civil War, many African Americans went west to work on railroads.
After the end of slavery, African Americans could move and find new work.
In the 1850s, many free African Americans from the north became ranchers.
During Reconstruction, African American politicians promoted ranching.
I am tired of fighting . . . It is cold and we have no blankets. The little children are freezing to death. My people, some of them, have run away to the hills and have no blankets, no food. No one knows where they are—perhaps freezing to death. I want to have time to look for my children and see how many I can find. Maybe I shall find them among the dead.

A during the Civil War, many African Americans went west to work on railroads.
B After the end of slavery, African Americans could move and find new work.
C In the 1850s, many free African Americans from the north became ranchers. In the 1850s, many free African Americans from the north became ranchers.
D During Reconstruction, African American politicians promoted ranching.

B After the end of slavery, African Americans could move and find new work. The recent events referred to in the question might have prompted many African Americans to seek employment on ranches as a means of finding new opportunities and economic stability.