I'd stop the supreme Court from giving the presidency to W Bush. I try not to think about what a timeline where we actually do something about climate change would look like, it's just too depressing.

Al Gore is an asshole and a neoliberal but I think he actually would've done something about climate change. I also don't think Osama Bin Laden would've gone through with 9/11 without a Republican in the White House.

Edit: upon further inspection, the title says OBSERVE a historical event. Oops.