The Great Depression in the United States began on October 29, 1929, a day known as "Black Tuesday," when the stock market–went for a crash. Putting the country into its most severe economic downturn. Some people lost their shirts; banks failed; the nation’s money supply diminished; and companies went bankrupt and began to fire their workers in droves. President Herbert Hoover urged patience and self-reliance: He thought the crisis was just "a passing incident in our national lives" that it wasn't the federal government's job to try and resolve. By 1932, one of the bleakest years of the Great Depression, at least one-quarter of the American workforce was unemployed. When President Franklin Roosevelt went in to office in 1933, he acted swiftly to try and stabilize the economy and provide jobs and relief to those who were suffering. Over the next eight years, the government instituted a series of experimental projects and programs, known collectively as the New Deal, that aimed to restore some measure of dignity and prosperity to many Americans. More than that, Roosevelt’s New Deal changed the federal government's relationship to the U.S. populace.
http://www.history.com/topics/new-deal
I disagree with you on that. Genocides an happen in the United States.