I don't know how many folks are aware of the connection between Boston and Nova Scotia? Back in 1917 two ships collided in Halifax Harbour, one of which was loaded with munitions (WWI). The explosion that occurred was the largest explosion in the world at that time. It literally wiped out Halifax, the devastation was almost complete. Hospitals were wiped out as were many of the folks that staffed them. Boston stepped up to the plate and immediately sent supplies and Drs. and nurses to aid in the recovery. Each year since, Nova Scotia has sent (free of course) the large Christmas tree to the city of Boston in gratitude. It is a tradition that has carried on and it has become something of an honour here to have one of your trees chosen as "the tree".