Civilization of humans with monochromatic eyesight

I was wondering, how would a civilization of humans who can see only in grayscale live their life? There is none of them that can see color. Everyone sees every thing in gray. Yet, color actually do exists. The environment they live in is Earth-like. Plants, animals, even the humans has color pigments and their sun is very much like ours.

How would being monochromatic affect their life and psychology? How would they see animals since both are monochromatic? Would most humans be vegetarian since they feel similarities with the animals (being monochromatic)? What events that happened in our world (world wars, development of airplane, nuclear science, etc.) that would be impossible to happen in their world due to them being monochromatic?

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Civilization of humans with monochromatic eyesight

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