Say you're given the ability to travel to an alternate universe identical to our own (ala WoD) at any point in human history with the ability to alter the course of history almost however you want. What would you do and why?
I would go back a 1,000 and introduce European domesticated animals to North America, just to see how the various civilizations and cultures would manage to develop with horses and sheep and others by the year 1492. Whether or not certain parts would be societally comparable to Europe and Asia.