The History of Christmas Trees dates back atleast 1500 years. To the time of Ancient England. The Druids used evergreen branches to decorate public buildings, and their homes during the Winter Solstice. Westernized Christian Culture adapted these practices into their Christmas Culture.
Trees used for Christmas were specifically mentioned in the early 1600's in Germanic countries. Families created these trees in a prominent place in their home and decorated theme with colored paper, small toys, food, and sometimes candles. As the germanic culture moved around Europe, and to the New World they brought this tradition with them.
Over time with the invention of the light bulb in 1879, lights quickly replaced candles adorning Christmas Trees, and decorations became more fancy with the class of wealth increasing as well. More and more elaborate and public displays of grandeur have adorned the Christmas Tree. People just handed down the tradition until it became as much apart of Christmas as Santa Claus, and a baby in a manger.