True and false.
It is probably true that if they had done nothing during the Great Depression we might have naturally returned to full employment late in the 1930s.
The problem was, by the time Franklin Roosevelt came in it looked as if our government might collapse. Roosevelt did most of the things he did out of a belief that if you didn’t then the system would fail. The New Deal was not about restoring hope to America or in of that other BS. It was about one thing and one thing only. Preserving public order and preserving the government of the United States of America. Let no one tell you any different.
Confiscating gold, destroying incentives for productive labor, and dinking around with public projects did not improve America’s economic situation or quality of life. I guess you could label FDR a success... if you regard the increase of central planning power as the goal, but it’s my view the purpose of just government is to protect liberty. FDR attacked liberty and private property.