Yep, you're right. I accidentally skipped a line while reading my source and thought it said that the same book had been published in Gainsville, Florida. My bad.
dictionary.reference.com/help/…Also, I was mistaken about the reason. The actual reason that the US spells "artifact" with an i is because Latin roots with the "Arte-" prefix change the e to an i when said root is given a suffix (artificial, artifice). English is a jumbled mess as it is, so the logic is that this helps make things easier.
For the record, I prefer artefact, because I pronounce it "art-eh-fact" rather than "art-ih-fact" as the American spelling would imply.