Why don't they standard-ize on just one?
In fact, the ‘-ize’ forms have been in use in English spelling since the 15th century: they didn’t originate in American use, even though they are now standard in US English.
In fact, the ‘-ize’ forms have been in use in English spelling since the 15th century: they didn’t originate in American use, even though they are now standard in US English.
