On 26 Aug, 15:07, Guy Macon <http://www.GuyMacon.com/> wrote:

> I tend to think of the UK spelling as being the standard, and the
> US as being the variant -- and I was born and raised in the USA.

There are (largely) two sorts of divergent spellings:
* 17th century spellings that the US has preserved and the UK has
shifted.
* Webster's fiddling 8-(