Why did "Crossroads" show us a different era earth?
The depiction of Earth includes a geographically accurate landmark: the Balize lobe of the Mississippi river delta, a feature formed between the 16th and 20th Centuries of the real-world Earth. However, no further conclusions should be inferred as the series creators deliberately avoid confirming whether Battlestar Galactica occurs in the real-world Earth's past, present, or future.
Well it would seem that BSG occured 150,000 years ago, either this was an oversight, or we might have gotten a different ending...
"If you don't like something, don't watch it again. Why whinge about it on a forum to a load of divs? Don't worry about it." - Karl Pilkington.