| Hey, I'm an American, but Enjay's comment made me think. SEATO's website (seato.org) spells it like organisation, so while both should be accepted, that should be the displayed answer. Although, weirdly, while most of the page spells it with an S, the title of the page is with a Z. Strange. And yes I think spelling it with an S is weird to begin with. It's clearly voiced. |