We have ample reason to suppose war has become a problem only in the past ________ years,since the invention of food-production techniques and especially centralized states.

Question

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This choice is the most widely accepted and supported by historical evidence. It is commonly known as the "threshold of civilization," as it marks the beginning of the Neolithic Revolution when humans transitioned from hunting and gathering to agriculture and settled communities. This led to the formation of centralized states and the rise of social hierarchies, competition for resources, and the development of organized warfare. Therefore, the past 10,000 years are often referred to as the "age of empires" or the "violent period" in human history.

We Have Ample Reason to Suppose War Has Become a Problem