Mass. Gen. Laws ch. 6, § 15I: Liberty Tree Day

Section 15I. The governor shall annually issue a proclamation setting apart August fourteenth as Liberty Tree day commemorating the first public shade tree planting in the new world in the year sixteen hundred and forty-six, one of the trees so planted being known from the year seventeen hundred and sixty-five until its removal by British soldiers ten years later as the Liberty Tree, a Symbol of Freedom.