way words are spelled in America differs substantially from the
Commonwealth, this is believed to originate from the War of Independence
when Americans began changing things in order to be different from the
British - this is also why Americans eat differently with a knife and
Canada, although part of the
British Commonwealth, has been influenced by its American neighbor and
has a kind of a pick and choose attitude with spelling, some words are
spelled the American way and some the English way.
OUR versus OR difference
in the Commonwealth is replaced with just "-or" in the USA.