The US President during the Great Depression was Franklin D. Roosevelt, who served from 1933 until his death in 1945.
During this time, the role of the Federal government changed significantly. In response to the economic crisis, Roosevelt implemented the New Deal, a series of programs and policies aimed at stimulating economic growth and providing relief to those in need.
One of the most significant changes was the expansion of the role of the Federal government in regulating the economy. The government created a number of new agencies, such as the Securities and Exchange Commission (SEC) and the Federal Deposit Insurance Corporation (FDIC), to oversee and regulate various industries.
The New Deal also included a number of programs aimed at providing direct relief to the unemployed and those in need, such as the Civilian Conservation Corps (CCC), which provided jobs and training for young men, and the Works Progress Administration (WPA), which provided employment for millions of Americans through public works projects.
In addition to these programs, Roosevelt also implemented policies such as the National Industrial Recovery Act (NIRA), which set minimum wages and maximum work hours, and the Agricultural Adjustment Act (AAA), which paid farmers to reduce production in an effort to raise crop prices.
Overall, the Federal government played a much larger role in the economy during the Great Depression, with the goal of stimulating growth and providing relief to those affected by the economic crisis.