Maybe there was more Irish spoken in America at the beginning of the 20th century than there was in Ireland, but the language wouldn't have stayed pure for very long. It would become a travesty of what it was. It is nothing to do with dialect. The same thing happened to the English language in America. The English-speaking Irish, of which I am one, would probably have the correct vowel sounds for to speak Irish more so than the Americans would. By the way, Aisling is pronounced ash (as in the ash tree) - ling (rhymes with sing). The ng at the end is soft and runs together. Dropping the g from the name corrupts it completely. It's no longer a vision!