No records of the Maine Coons exact origins and date of introduction to the United States exist, so several competing hypotheses have been suggested, the most credible suggestion being that it is closely related to the Norwegian Forest cat and the Siberian. The breed was popular in cat shows in the late 19th century, but its existence became threatened when long-haired breeds from overseas were introduced in the early 20th century. The Maine Coon has since made a comeback and is now one of the most popular cat breeds in the United States.