These tags are not broadly used - though this is not exactly unexpected, as we tend to focus on applied cooking than on cooking history.
food-history has 14 questions and has a tag wiki excerpt
Questions pertaining to current culinary practices and foods--how did we get where we are today?
history has 31 questions and no tag wiki.
Can we combine these into one? I don't have a particular care about which is which but I don't really see why we have two.
If the concern of food-history is that it might relate to foodstuffs only (despite the excerpt), I would recommend that "food" is redundant as this is a site about cooking, so perhaps history should win out. Alternately, we could replace them both with something more specific than "history" but broader than "food-history" like culinary-history.