Grammar point example sentences

[Infidel]

なぜ is slightly more casual. That's all.

I've been told by two different people that naze was more formal than doushite.

[Yudan Taiteki]

I've actually seen both explanations of なぜ so I don't know which one is right. Golgo 13 says なぜだ！ a lot and he's not exactly a bastion of formality, but we all know about relying on manga for language examples.

As for のだ, I would recommend seeking an explanation in a book or (reliable) website; that's hard to explain in just a forum post.

[Steve_Poppers]

Well, is there a difference between using のだ　and　から? A time and place for each?　Or are they interchangeable?