Note that the above chart is missing one key slice. In 2004, Massachusetts legalized same-sex marriage. No World Wars or other disasters befell the state, but the Red Sox won the World Series! So remember, in the event of same-sex marriage, two people get married AND long-standing bad sports curses break.
(And that really is the most exciting thing that happens. As Dan loves pointing out, Sarah and I are just as boring as every other couple!)