The National Housing Act was passed by Congress, and signed into law by FDR, in 1934. It created the Federal Housing Authority (FHA), an agency designed to boost loans for building houses. Before the Great Depression, the federal government had very little involvement in the housing market, so the FHA role was groundbreaking. 

This bill is one of those hidden pieces of legislation that radically transformed the possibility for the American working class to have a middle-class life at home, all built on federal guarantees to regulation of the mortgage industry and the mechanics to push money into the hands of homeowners. It propped up whole industries and paved the way to the suburbs that brought workers out of slum and into new (or improved) homes.