Originally Posted by miles3347
Janeway did not use time travel to get the ship physically home gust the technology to get them through the transwarp hub alive. The temporal enforcers that refused to return the ship to the 24th century because it would have altered future events like decimating the borg unimatrix 1 and it probably was a established event admiral Janway getting the ship home via the transwarp hub using future tech. It was their own ship that caused the event with Captain braxton in the twentieth century.
The episode starts with an established timeline though. Voyager gets home but without help from future Janeway. So Admiral Janeway does alter history by using timetravel and bringing back future technology to the past.