To be fair, that's probably more accurate. Almost no 'countries' on this quiz were recognized as legitimate; they did, however, have a functioning government.
They declared separation from the crown before anyone else, so they ended up acting independently for a while. I will probably update the quiz (eventually) and add the other twelve.
California: independence was declared, but very little territory was actually held.
Kentucky and Missouri: they were splinter governments during the Civil War, and pro-Union governments also existed.