Final answer:
The period known for the loss of 400,000 farms through foreclosure and widespread unemployment and homelessness between 1929 and 1932 is called the Great Depression.
Step-by-step explanation:
The period between 1929 and 1932 when 400,000 farms were lost through foreclosure, and people were left jobless and homeless, is known as the Great Depression. This was a time of severe economic downturn where many suffered immensely. The Dust Bowl, a series of droughts, further devastated farmers, leading to foreclosure on their properties and mass migration in search of work. Authors like John Steinbeck documented the harsh realities of this era. Franklin Roosevelt's election brought the New Deal, which aimed to mitigate the crisis through programs like the Works Progress Administration (WPA).