I agree with José, you have at least one dialect in each hispanic country. Or even more, since in a country can be several regions with different dialects (although with softer differences). I think people simply doesn't devote their lifes to imitate the sounds and vocabulary and follow the prescriptions of some authority located hundreds or thousands kilometres away, and just use and modify the language at their will, considering it naturally theirs, which I think is good. This gives as result the existence of dialects. Spanish happens to be a very extended language, so it naturally diversifies in so many dialects. You can say the same about Chinese, for example, which has several variants too. And even English has its own singularities if you talk about British, American, Australian, Southafrican or any other variant, and not only pronunciation differences, but even vocabulary and grammar ones.

Because we need to feed too many politicians.

this the same in all languages

There are as many spanish dialects as there are hispanic countries. It's all the same in the end.