I can see that my trivia question has more than one answer, depending on how you understand the question.
In terms of the number of trees, the answer that I was looking for is Israel. Perhaps the US has more forests today, but surely the US does not have more trees today than it had in 1900 - just imagine how many trees we cut down to make room for all urban areas we have today.
I apologize for doing this, but I am going to switch to a different trivia question which surely only has 1 answer:
Up until a certain year, no manager had ever won baseball's World Series in both the American League and the National League. Then, one year, this record would be set no matter which team won the World Series (meaning, both managers in the World Series had already won a World Series in the opposing league). Which year was it, and who was the winning manager?
GedMan