Why did shantytowns, disparagingly called hoovervilles over president hoover's perceived inaction, emerge across the nation?

Hoovervilles, which were really just shantytowns occupied by the newly homeless as a result of the Stock Market Crash of 1929, emerged due to the economic devastation that took place in the United States as a result of the '29 crash and the resulting Great Depression. They were named after Herbert Hoover, who was largely blamed for the Depression.

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Explanation:

Out-of-work Americans, unable to pay mortgages or rent, were evicted and made homeless. They built the shantytowns in public parks and vacant lots.