Thank you so much, Emily :)

Hi! I don't speak Portugese, so I'll answer in English, I hope it helps you still! There is literally no difference between "wieso", "weshalb" and "warum" in German any more. In the past there used to be one, but nowadays they're all equal. (In the past "warum" would be used to ask for the reason behind something - "wieso" was used to ask for the cause of something - and "weshalb" would be asked, to find out the purpose behind something). Just as a little background information, in case you're still wondering for why there are three words, that have just one meaning :-)