**PLEASE READ THIS MESSAGE IN ITS ENTIRETY BEFORE TAKING ACTION.**

Your post has been removed as it violated [Rule 1](http://www.reddit.com/r/AskReddit/wiki/index#wiki_-rule_1-) because it did not end with a question mark.

* **All posts must end with a question mark.**

* You must post a clear and direct question, **and only the question**, in your title. 

* Do not include answers or examples in the post title.  You can post answers as comment replies when you've reposted.

* Please combine clarifying sentences into the question itself.

Please note - once posted, the titles cannot be edited. If your title breaks the rules, please feel free to make a new post that fits within the rules.

If you feel this was removed in error, please [contact the mods](<http://www.reddit.com/message/compose?to=%2Fr%2FAskReddit&subject=Rule+1+Post+Review+Request&message=My+post+was+removed+Rule+1,+please+review%3a%0d%0a%0d%0ahttp%3A%2F%2Fwww.reddit.com/r/AskReddit/comments/eahc84/what_historical_world

‪What historical world event seems most likely to have been caused by a time-traveller?‬