The tag history currently redirects to cinema-history. I think they should not be synonyms.
cinema-history questions clearly should ask about the history of cinema and movies in general, how film technology evolved and what happened in what era. That in fact matches the content of the questions currently tagged this way.
history however should in my opinion be reserved for questions regarding historical movies, meaning it should be a genre tag along the lines of horror, thriller and comedy.
Instinctively I would tag new questions for movies like Alexander, 300 or Gladiator with the history tag, which would be wrong under the current configuration.
The ambiguity between the two tags could be resolved by writing helptexts for both tags that clearly define the scope.
What do you think? Should history and cinema-history really be synonyms?