Economics of the US history

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 five pages.