One more letter!

How true, La. The Romans were soldiers, not letter writers (apart from Cicero, Ovid, and other 'poets' in exile).

Which is why the Persians aren't too bothered, although they might have to invest in a new filing cabinet for the ever growing stack of threatening letters.

But...Shouldn't USA be spelt USofA? or USOA?
And why do the Romans add Q to SPR when Populesque is all one word?

THE ANSWER: Sorry, it was a bit of a trick question, but the difference between SPQR and USA is that there is no difference. They are both initialisms where every letter is pronounced separately. Same with HIV. AIDS on the other hand, is an acronym.

Who decides these things? Why are some 'words' pronounced as acronym 'words' and others spelt out as initialisms?
Saying "Spqr" is a bit tricky, but "Usa" seems easy enough. Same with "Eu."

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