I'm afraid I disagree. It is certainly not all pioneered by Australia, or anything of the sort. The only reason people seek to blame Australia for sledging is because several Australian captains have been public about the fact that they believe sledging is an effective tactic to win games of cricket.
For example, Nasser Hussein was a sledger. Steve Waugh said in his book that Nasser was always talking, always commenting to the Australian players and trying to put them off. Hussein was the guy who called Graeme Smith "that guy" during a press conference, and called him "Bob" or something at the toss during a test. Certainly seems like a clear attempt to put him off his game, and the attitude of a sledger, doesn't it?
Hansie Cronje was also a sledger. Both of them were captains of opposing teams at the same time as Waugh, and yet Waugh has the reputation because he made the "mental disintegration" comments. The fact that he was honest about it doesn't make him any worse than anyone else. The West Indies sledged back in the 80s, and there's plenty of examples of even guys like Richards (who had a reputation for being pretty stoic) engaging in it, so who knows what the others said. Tony Greig had a reputation for it as well, I believe. So did Dennis Lillee and Ian Chappell, and Ian Botham and Javed Miandad... all guys who retired some time ago. The only difference is that now there are stump mics so people at home can hear all of it.