...And a little more Infinite Crisis #6

Okay, so Earth-154 isn't Generations-Earth as such, but rather the Super-son's earth, which debuts in World's Finest #154. Earth-97 is the Tangent Universe, which was published in 1997. Earth-247 is, of course, Legion Earth.

Earth-898 is still a bit unclear. 1898 was the year of the Spanish-American war on our Earth, of course, but Mexico was independent by then and so to have a battle at the ruined Alamo as part of that conflict (with all of the DC western characters present) requires a bit of historical finagling. I guess that's what's going down, though, with the guy on the horse being Zorro most likely...

And that leaves Earth-462, with the Teen Titans fighting Nazis, possibly in Washington DC. Still not sure what the number means there. Adventure 462 was the Death of the Earth-2 Batman; the other books that reached 462 didn't having anything of note happen in that issue.