Why was it cancelled??

Both of those although there was a third, overriding factor that weighed against the show. When it was originally conceived by Glen Morgan and James Wong it was considered DOA by the VP of Programming Peter Roth. Roth prefers drama he can understand and a "space opera of WWII" was not something he could appreciate. It should also be noted that while he was Chris Carter's boss at FOX he spent at least half of the first season of the X-Files trying to get Carter to change the show into a more episodic format with stories that resolved themselves neatly rather than leave any lingering doubts about what really was "out there". If Roth had his way the X-Files would basically have changed into an FBI version of the late 70's Project UFO.

Morgan and Wong had worked extensively on the X-Files with Carter and knew Roth, so they pitched to the executives above him. They won the arguement but Roth was royally pissed. A friend of mine who worked for FOX at the time swears that Roth vowed to kill the show - it was too big, too expensive, too complicated and people would never watch it. So when FOX bought 13 episodes what was he to do? Well he juked it around the schedule, pre-empted it to show football, baseball, and hockey games. Did everything he could to guarantee that it would never develop a fan base and even when it's ratings were better than the first episodes of the X-Files he didn't let up. FOX eventually picked up the show for the rest of the year, but shortly after that it was announced that Roth would be taking over as head of FOX programming for the next seasoun. He basically told Morgan and Wong to forget about renewing the show.

At the same time that the show was under threat of cancellation, officially for poor ratings, other shows were getting save by letter writing campaigns so fans tried to save the show, but FOX (Roth) basically told us to get stuffed. He was impressed enough with the effort to let Morgan and Wong pitch Millenium to FOX, and he approved that. Of course Millenium was an X-Files clone and that was something he could understand. Guys like Roth would rather have 10 Ally McBeal clones than one good original show. That's why S:AaB was cancelled, ratings in this case were a symptom of the disease, not the reason.

lol

Oh puh-leez, FAUX NEWS and Fox Programming are on polar ends of the political spectrum; while it's true that FOX's "news" leans further to the right than a man who just had his left leg blown off, most of their licensed TV shows are firmly entrenched in politically correct Hollywood Liberalism. Examples of this are so ubiquitous and obvious it's not even worth listing them.

Nah, S:AAB was canned because it was a) hella pricy and b) not particularly popular

Sometimes, things really are that simple.

star trek deep space 9 did well on Fox for 7 seasons. too bad some other network couldn't pick up the show like sci-fi network or so, but there were probably too many problems in the show's management and perhaps the actors wanted to move on. perhaps there can be a reboot or so on Netflix, though it probably won't happen.