What a good minor with a history degree?

Really any of them except creative writing would be good depending on what you like best and what type of history you're studying. If you're specializing in European history from 1350-present, then studying something like law or government/ political science will be far more useful. If you're studying ancient history (Neolithic Revolution, River Valley civilizations, etc), then archaeology would probably be the most useful. Of course, go with your heart. If you really love creative writing, do that even though it won't help your history degree much.