Answer:
Because these events took place after the end of slavery. This allowed African Americans to find work and receive salaries in activities they were familiar with, such as tending livestock.
Step-by-step explanation:
The events presented in the text above took place after the end of the American Civil War, when slavery was banned throughout the country. However, African Americans were people who had experience with agricultural work, which included livestock care. This experience and the end of slavery allowed African Americans to be hired by farmers to take care of cattle and crops, this time receiving a salary for their activities.