FDR created millions of jobs to improve public lands with the:

Civilian Conservation Corps.

Explanation:

apex

FDR. Roosevelt, who was then the governor of New York, campaigned on a set of relief programs called the "New Deal". One of the foundations of the New Deal was a massive public works program, in which the government would hire unemployed workers and put them to work building roads, bridges, dams, and many other projects. FDR believed that putting people back to work would restore public confidence in government and all parts of society. Furthermore, if people had jobs, they would have money to spend. Increased spending, FDR hoped, would revive the economy