It’s called ethnocentrism
And your question is a good example of it
Black pepper is a predominantly western, aka white people, spice due to the climate it grows in.
Most people aren’t white. Therefore black pepper isn’t one of the most popular slices in the world.
Salt is a mineral required to live and we are evolved to seek out salt
Salt isn’t easy to get in food with the exception of blood.
So we find salt in nature and add it to food.
Additionally salt is a very good preservative. So we use it a lot to keep food fresh.
Those 2 things combined make it popular. Because if you don’t eat it you die.
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