Oregonians.
Wisconsonians? Nope.It's Wisconsinites.
Guatemalans. However the term 'chapines' is used locally.
They're called Greeks
Any person should be addressed in the same manner: If you know them well: By their first name If you know them professionally: Mr. Mrs. Dr. Professor Reverend Rabbi Sir Madam (or other title accorded...
They are also people They are just people that are mean.