What is the name of your state? CA
What is the copyright status for those articles / short stories on the internet with "Author unknown" stated. Would I be able to publish them without copyright breach? Thank's
Unless you have some written evidence that the articles were given over to the public domain, or evidence that the articles were first published in this country prior to 1923, then it is most likely that the works are covered by copyright. If the works were published after 1964 (with copyright notice) or after 1989 (with or without copyright notice), then they are for sure covered by copyright (unless given over to the public domain, in writing). Current copyright term for a work by an unknown or pseuodnymous author is 120 years from date of creation, or 95 years from date of first publication, whichever is longer.
In other words, you need permission from the copyright owner to reprint these articles legally.