Why don't all Asians just speak the same language?

Anonymous
As well as all Europeans, and all Africans. Kinda like how in South America, they speak Spanish (besides Brazil). It would make traveling so much easier. I'm sure there are some words that Spanish speakers say differently from each other but that's bound to happen in any language. But they can still understand each other. Instead of going to Germany, then going to Greece or going from China to Japan, using different phrases.
Why don't all Asians just speak the same language?
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