I think this question may involve more than Spanish, and may include Romance languages or even Latin. I wonder why, when, and how did vowels E and I get special treatment from consonants like C, G, ...
Is the name of the country south of the United States spelled México or Méjico? Which is the official name of the country in English and Spanish? When is each version used?
Why is Usted sometimes abbreviated as Vd. instead of Ud.? Is there any difference in usage between the two?
I've noticed that the word Usted can be abbreviated at least 2 ways, the most common of which being Ud. and Vd. to my knowledge. I see how Ud. makes perfect sense, but why is a V used instead of a U ...
I have seen several times the use of @ instead of 'a' or 'o' for refering masculine and femenine words at the same time. For example: Hola a tod@s. Is this an accepted use?