What geographic factors led to the decline of sumer?

select all correct answers

the cultivated soil had poor drainage.

the tigris and euphrates rivers flooded every year, leaving behind dark, fertile soil.

grain fields of one city–state bordered those of another, which caused territorial wars.

it was located in a flat plain, and isolated from trade routes.

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:

lee and grant, both of whom held the highest rank in their respective armies, had known each other slightly during the mexican-american war (1846-48) and began their dialogue by exchanging awkward personal inquiries. characteristically, grant had arrived in his mud-splattered field uniform while lee had turned out in full dress attire, complete with sash and sword.

explanation:

an era of negotiation.

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