The main cause of Herbert Hoover's loss in the 1932 election was the Great Depression.
The Depression began in 1929 and had a devastating impact on the American economy.
By 1932, millions of Americans were unemployed, and many had lost their homes and farms.
Hoover's policies were largely unsuccessful in addressing the Depression, and he was widely blamed for the country's economic woes.
The image you sent shows a map of the United States with the results of the 1932 election.
As you can see, Roosevelt won the election in a landslide, carrying 42 of the 48 states.
The only states that Hoover won were in the Northeast, which was a Republican stronghold at the time.
The text on the image also mentions that the Democrats put together a new coalition of voters in 1932.
This coalition included urban immigrants, blue-collar workers, African Americans, farmers, and Southerners.
These groups had all been hit hard by the Depression, and they were eager for change. Roosevelt's promise of a New Deal appealed to these voters, and they helped him to win the election.
There were a number of factors that contributed to Hoover's loss in 1932, but the most important was the Great Depression.
The Depression caused widespread economic hardship, and Hoover's policies were seen as ineffective in addressing the crisis.
As a result, the American people turned to Roosevelt and the Democratic Party in hopes of finding a better way forward.