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The world is not overpopulated. If the entire population of the world lived in one large city, we could all fit in Texas. Then, the rest of the world could be used to produce food.

The western nations are not even having enough babies to replace the current population.

War is an extension of politics. Wars are fought over many things, among them a "you're not like us mentality" that has nothing to do with resources.

weedonald has it pretty much correct.