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 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.
- For each question: write the question as a title and then provide your answers.

TEXT BOOK: Gary M. Walton Hugh Rockoff. History of the American Economy. 12th Edition, 2014.