America is a continent going from Alaska to Chile and consisting of 35 different and independent countries (although someone in north America does not agree with that).
Therefore, in this blog American can be anyone living in this continent and it does not matter whether he comes from Chile, Venezuela or USA.
You might point me out that there is not any other denomination for people living in USA. Well, this is not our problem. They can invent a name to indicate themselves, and if they do not want, we can ask some citizen of south America to help them!
Furthermore, the use of the word American for people living only in the USA is offensive towards the different nations in central and south America that suffered the USA colonization and domination between the twenties and the end of the last century (see the last two sections of the 2nd part of: Open Veins of Latin America, E. Galeano).
I hope that every one agrees with that!
I wish you all the best!