In world history 632 would be a good start point and 1500 a good end point, because Islam has a worldwide impact and so does the era of colonization. The fall of the Western Roman Empire only very indirectly had any impact on world history, and the same can be said of issues having to do with Christianity (like conciles or Protestantism), the essence of which are lost on a non-believer. Book printing is directly related to the invention of paper, which was done in China, but on another level might be a candidate, though on the long term, as its impact was quite slow globally. The Renaissance and the connected flowering of the Arts is just too Eurocentric, IMHO.