I think the traits are the mostly for game balance (and suitable peacefull GA trigger - that's why Chinese are militaristic - so that Great Wall can trigger their GA).
As for Spanish being commercial - well, the Commercial trait does two things - it allows you to have big-area spanning empires and gives you more gold. That's what Spain achieved actually - the exact name of the trait is irrelevant - the Commercial effect suits Spanish civ quite well.
As for Spanish being commercial - well, the Commercial trait does two things - it allows you to have big-area spanning empires and gives you more gold. That's what Spain achieved actually - the exact name of the trait is irrelevant - the Commercial effect suits Spanish civ quite well.
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