BTW the New Deal tried central planning and quickly rejected it. I'd say that the intense application of the antitrust law in the late 1930s was a key factor that helped end the Great Depression. The war, and wartime government powers, were also key: the amount of federal government overreach and and reforms do not compare to what e.g. the second Trump administration has attempted. It was mostly done by people who got their positions in the administration more due to merit and care about the country than loyalty, and it showed.

The post-war era, under Truman and Eisenhower administrations, reaped the benefits of the US being the wealthiest and most intact winner of WWII. At that time, the highest income tax rate bracket was 91%, but the effective rate was below 50%.