Comics are published all over the world but how widely the input and output of a given region reaches depends on the distribution network but this is determined also by language and cultural specificities.
The concerns of publication can be run by committee or can seem to come down to one individual. From what we've seen, publishing comics is not for the faint-hearted. It is fortunate for the reader, then, that he/she gets to see the work of fine draughtsmen of the field, as comics scripters may once have called them.
The world of comic book publishing is dominated by Marvel and DC, a perpetual campaign waged over a dwindling readership (or so we're told), but many another publisher has come and gone; if it wasn't for the Overstreet Price Guide, we might not remember such curiosities as All Negro Comics and Red Warrior.
Niche marketing dictates some publishing ventures to this day. I think cartoonists like Peter Bagge need the underground to work and political statements are always going to be potentially problematic for the publisher who carries the piece.