Thank you for posting you question here at brainly. The longest, deepest, and most pervasive depression in American history, lasted from 1929 to 1939. Its effects were felt in virtually all corners of the world, and it is one of the great economic calamities in history.
All of the above is the correct answer.
The obvious answer would be business leaders. The reason why this is true is becaus business leaders were often the ones who were touting the ideas of social darwinism and how their company is better and will stomp out the smaller one in proper sociodarwinistic fashion.
