The collapse of mesopotamian society, like the collapse of later civilization, was caused

a constant invasions from foreigners
b a series of famines
c migrations of large groups to other countries
d tension between neighboring city-states

i really really really really really really dont know

the dust bowl, otherwise known as the dirty thirties, was a huge dust storm that killed multiple (and i mean  multiple) farmer's crops, leaving them homeless, and foodless, and jobless. in california, there were 5.7 million residents, and the population shrank as mexicans were repatriated. however, when the dustbowl happened, a lot of people began to move to california. by 1940, 250,000 people had arrived. therefore, your answer would be  the population increased, massively.  i hope this !

explanation: