Please provide a comprehensive answer to the following two questions:

1) Which were the main causes of the Great Depression?

2) Why did the Great Depression last so long?

Indications:
• To answer these questions, please start with our textbook (Gary M. Walton. Hugh Rockoff, History of the American Economics. 12th Edition,2014) information and then use at least one more reputable source for your research.
• Please use the bibliographic information recommended by the Modern Language Association (MLA).
• Length: at least six pages, including bibliography