The Christmas tree first came about after the Reformation and Germany is given as the first use of the Christmas tree, but before then churches and houses were decorated with any thing green.
The country is Norway, and the reason is a 'thank you' form the people of Norway to the people of Great Brittan for the help and support given to the people of Norway during the second world war....
Worship of the decorated evergreen tree goes way way back. Almost to the beginning.
Earliest accounts say that is was part of Babylonian sun worship by Nimrod and his mother/wife Semiramis. And...