It has to do with each areas climate. Spices for the longest time with the only food preservatives and in hotter environments near the equator where any kind of organic material broke down faster, you needed spices to help preserve it for longer, some more tropical regions developed more spicy foods and more temperate regions had them less spicy. As the spices eventually got exported to the rest of the world through colonialism, you see places like Britain developing a taste for spicy food.
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