The Massachusetts Historical Society (MHS) is a private, nonprofit organization founded in 1791. It is dedicated to collecting, preserving, and sharing the history of Massachusetts and the nation. The society houses a vast collection of manuscripts, documents, and artifacts that provide insights into American history, including materials related to the American Revolution and notable figures like John Adams. MHS also offers educational programs, public lectures, and exhibitions to engage the community and promote historical research. Its library and archives are open to researchers, students, and the public, making it a valuable resource for anyone interested in the history of Massachusetts and the broader context of American heritage.