Final answer:
The Civilian Conservation Corps had a lasting impact on environmental conservation and park development, contributed to the economic welfare of families, and laid the foundation for modern environmentalism in the United States.
Step-by-step explanation:
One long-term effect of the work of the Civilian Conservation Corps (CCC) is the substantial contributions to environmental conservation and the development of state and national parks that we still enjoy today. The CCC, established during the Great Depression under President Franklin D. Roosevelt's New Deal, was a public work relief program that offered employment to young men, ultimately planting an estimated 3 billion trees and developing 94 national parks and 711 state parks. The corps also played a significant role in the early environmentalist movement in the United States.
Beyond environmental impacts, the CCC provided valuable vocational training, allowed participants to earn their high-school diplomas, and sent much-needed financial assistance to their families. With over $25 of the $30 monthly wages sent home by the workers, the CCC had a direct positive effect on the economic welfare of the participants' families.
The CCC's work helped to lay the foundation for modern environmental conservation efforts and continues to influence how parks and natural resources are managed and preserved in the United States.