Christmas Tree trivia

Here are three questions about Christmas tree history.
Which American President began the ceremony of adding electric lights to the outdoor White House Christmas tree and having a ceremony when lighting the tree?
Herbert Hoover?
Calvin Coolidge?
Theodore Roosevelt?
The answer is President Coolidge in 1923.

When and where was tinsel invented?
Tinsel was invented in Germany around 1610 and was originally made from silver by machines which stretched the silver into paper thin strips.

It is fun to visit Christmas tree farms. How many states in the United States have these farms?
40?
50?
48?
The answer is 50 since there are Christmas tree farms in all 50 states.