The 1920s was "a long time ago" and the Andromeda galaxy is "a galaxy far, far away." Maybe the original trilogy took place 100 years ago in the next galaxy over.
In the lead up to the release of Episode 1, the Sci-Fi channel ran some bumpers of fans waiting in line arguing with each other. One of them said something to the effect of, "Given that this is a prequel, and that we know the universe is expanding, shouldn't the crawler read, 'A slightly less long time ago in a Galaxy slight less far away...'" 25 years later and that still pops into my head sometimes.