History of the American Economy-- this is assignment for hifsa shaukat

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.

the name of the book:
Gary M. Walton. Hugh Rockoff, History of the American Economy. 12 th Edition, 2014. ISBN-13: 978-1-111-82292-7

•       Please use the bibliographic information recommended by the Modern Language Association (MLA).

•       Length: at least five pages.