Watertown, Massachusetts, residents and visitors have a chance to step into a little-known but pivotal chapter of early American history at a Treaty Day event at the Mosesian Center on Saturday, July 18th, from 2 PM to 5 PM. According to the Historical Society of Watertown, the program will spotlight the Treaty of Watertown, signed July 19, 1776, which the society describes as the first international treaty made by the emerging United States with foreign Indigenous nations, specifically the Mi’kmaq and Maliseet tribes.…