Early civilizations most likely cooperated on the following:
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Sharing limited resources - Cooperation was essential for managing shared resources like water, land, and food, especially in agrarian societies.
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Coordinating government - Establishing and maintaining a centralized or organized government required cooperation among leaders and citizens to create laws, enforce order, and regulate society.
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Blending cultures - As civilizations came into contact with one another through trade, migration, and conquest, cultural blending was a form of cooperation that enriched societies through the exchange of ideas, practices, and technologies.
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Increasing trade - Trade often required cooperation for the mutual benefit of exchanges, establishing trade routes, and negotiating relationships with neighboring civilizations.
Thus, all four options are applicable to early civilizations' cooperation.