There were several different important events that took place in the US during the 1930's. The following is a list of events:
1) Beginning of the Great Depression- This lasted throughout the entire 1930's and was caused by several different factors, including the Stock Market Crash in late 1929.
2) President Franklin D. Roosevelt is elected- FDR is elected in 1933 for the first time and takes over in hopes of helping America recover from the Great Depression.
3) President FDR implements the New Deal- This New Deal consists of several different government agencies aimed at helping the American people and the economy recover. Some of the most famous agencies that still exist today in the Social Security Administration and the Securities and Exchange Commission.