1) Progressive reform lost momentum in the 1920s with respect to regulation of business as the federal government adopted a laissez-faire approach and removed itself from regulating the economy, leading to rampant speculation and ultimately the stock market crash and Great Depression.
2) Labor reform also declined as the diversity of immigrant workers made unity difficult due to language and cultural barriers, and private labor organizations were not encouraged.
3) Social welfare for immigrants decreased as well, as the U.S. adopted an isolationist stance in the 1920s and passed laws that significantly reduced immigration and created an unhospitable environment for foreigners.