In general, no, Mesopotamia did not fall because of attack from other empires, since it was primarily due to the Tigris and Euphrates Rivers drying up that led to a lack of produce, and therefore a fall in the empire itself.
The CCC was said to PROVIDE JOBS FOR YOUNG MEN.
It gave the unemployed young men an opportunity to work.
It limited the power of the king
The writers of 1920s were known as the lost generation due to them being the post WW1 generation. Cultural, moral and spiritual values were lost as well as hatred towards others. In addition, writers from that era tender to focus on self rather than the world as around them.