What If The United States Suffers Another Great Depression?

The Great Depression was a monumental event that shifted the economic center of the United States. And while the Great Recession was very bad, it still doesn't hold a candle to the impact that the Great Depression had. Despite its negatives, the Great Depression lead to some fundamental shifts in American society that brought many long lasting benefits to the American people. Chief among them social security. So what if another Great Depression hits the United States?