Eleanor Roosevelt Christens USS Pine Tree

The Penobscot Indians participate in an event in Camden, ME, where they go on the warpath against the Axis. The event features the launch of a coal barge sponsored by Mrs. Franklin D. Roosevelt, who is honored by the tribe. The Pine Tree, the largest wooden ship built in the US in 25 years, is christened and will carry coal cargoes.

What is significant about the pine tree ship mentioned in the text?

How long has it been since the last wooden ship was built in the US?