Final answer:
Photojournalists were hired by the Farm Security Administration of the U.S. Department of Agriculture to record the Great Depression in the 1930s.
Step-by-step explanation:
The historical event that photojournalists were hired by the Farm Security Administration of the U.S. Department of Agriculture to record was the Great Depression in the 1930s.
During this time, the government commissioned photographers like Dorothea Lange, Ben Shahn, Walker Evans, Arthur Rothstein, and Carl Mydans to document the social conditions and challenges faced by farmers and migrant workers.
One of the most iconic photographs taken during this period is "Migrant Mother" by Dorothea Lange, which captured the hardship and suffering of the people during the Great Depression.