The act has to be small(ish). You can’t say “Make everyone vote a certain way!” As an example I’ll give mine.

  1. Take all of the money I currently have in savings and invest in Nikola Tesla and attempt to slander Edison.
  2. Ride the train with Edgar Allen Poe and make sure that he made it to wherever he was going safely and keep an eye on him for a few days to make sure he was ok.
  3. Sit on top of the library of Alexandria with a SOPMOD and several hundred magazines worth of ammo.

Update: gotta say, there’s a lot less “save my favorite musician from death” or some such than I thought there’d be.

    • bamboo@lemmy.blahaj.zone
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      20 hours ago
      11/22/1963 spoiler

      Although kinda the opposite, the book 11/22/1963 is about a time traveler who stops the JFK assassination, but then returning to present day, finds the world in ruins because JFK lived and bipartisan/international sympathy over his death never happened, so the cold war escalated to the point of nuclear war, and present day was like the world of Fallout.

      Impossible to say, but it’s possible the reverse could be true, and if Regan died, the USSR could have seen an opportunity and attacked, starting mutually assured destruction?