This is correct and something I just learned myself. I am going to be putting in a proposal in the next congress to note for those trade buildings that it counts as an historic event, to prevent such confusion in the future.Hello,
Playing as Arabia. Arabia gets bonuses for completing historic events. In the wiki there are four such events.
I just completed a trade route (not on the historic event list) with a foreign Civ and it triggered Arabia's special bonus for historic events. Is this intentional?