Because of the establishment of city-states __________________.?
Sumerians were forced to compete over the scarce resources
Sumerians could have a variety of occupations
Sumerians no longer used slave labor
Sumerians lived in perpetual peace
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The second choice has nothing to do with the existence of city-states, and the third choice doesn't make sense and is not true, and the fourth choice is completely backwards because the existence of multiple city-states meant that they would almost always be warring with each other. By process of elimination (and because it's true and logical), the first choice is the correct answer.