Not in the US, Copyright laws are Federal Laws. States cannot change the Federal law.
Other countries have different laws, but most are very similar and based on international agreements.
Each book has its own copyright information.
Each program has its own copyright information.
The year of the encyclopedia is the year of the copyright; there are far too many editions to answer this question directly.
Each song has its own copyright year.
Each volume has its own copyright date.
Each issue or edition has its own copyright information.
Each of the 15 editions has its own copyright year.
Each issue would have its own copyright information; the first issue would be 2002.
A company doesn't have a single copyright date; each copyrightable work it produces would have its own date.
Yes; there is no minimum age for copyright protection.
The song itself is controlled by Music of the West, a division of Songwriters Guild of America. Each recording may have its own copyright.
Warner Chappell administers copyright of the song itself, but each performance and recording will have its own additional copyrights.