There are 50 states in the US and we're working on where they all are and how to spell them. Rather than stand around all day reading the names of the states for our spelling tests, I just use a map and write in the US Postal abbreviation for each state, note how many states are on the test, and away the children go writing down their answers.
We're doing the US in sections (Northeast, Midwest and so on) so that it isn't too overwhelming. Just for fun, check out what happens when you give Aussies a blank map of the US and ask 'em to fill in the states. Mine is Missouri, midway up the "no one important lives here" label on that first map.