Why were there hunter gatherers?

Hunter-gatherer cultures forage or hunt food from their environment. Often nomadic, this was the only way of life for humans until about 12,000 years ago when archaeologic studies show evidence of the emergence of agriculture. Human lifestyles began to change as groups formed permanent settlements and tended crops

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the us hoped to prevent any nations from leaning towards soviet union-based communism. the containment policy was established in hopes of keeping communism from spreading to new places.