Even for those of us in the US, this can be confusing. I had to memorize those codes a long time ago, but I haven't really used most of them in decades. For e

Even for those of us in the US, this can be confusing. I had to memorize those codes a long time ago, but I haven't really used most of them in decades. For example, MI. Is that Michigan, Missouri, or Mississippi? (It's Michigan.) MS? Mississippi. MO is Missouri, which isn't intuitive unless you already know the other 2 and realize there isn't a lot of other letters they could use. So yeah, full names is better. :)