A crane hoists the "Tree for Boston" evergreen Christmas tree, an annual gift from Nova Scotia, to position the tree on the Boston Common, Tuesday, Nov. 21, 2023, in Boston. The Christmas tree is presented each year to Boston to show gratitude for the help Bostonians provided after the devastating Halifax Explosion, on Dec. 6, 1917. The tragedy occurred when SS Mont-Blanc, a French cargo ship carrying high explosives, collided with the Norwegian vessel SS Imo in the harbor killing approximately 2,000 people. (AP Photo/Steven Senne)