Massachusetts (/ˌmæsəˈtʃuːsɪts/ (listen) MASS-ə-CHOO-sits, /-zɪts/ -⁠zits; Massachusett: Muhsachuweesut [məhswatʃəwiːsət]), officially the Commonwealth of Massachusetts,[b] is a state in the New England region of the Northeastern United States. It borders the Atlantic Ocean and Gulf of Maine to its east, Connecticut and Rhode Island to its south, New Hampshire and Vermont to its north, and New York to its west. Massachusetts is the sixth smallest state by land area, but with over 7 million residents, it is the most populous state in New England, the 15th most populous in the country, and the third most densely populated, after New Jersey and Rhode Island. The state’s capital and most populous city, as well as its cultural and financial center, is Boston. Massachusetts is also home to the urban core of Greater Boston, the largest metropolitan area in New England and a region profoundly influential upon American history, academia, and the research economy. Originally dependent on agriculture, fishing, and trade, Massachusetts was transformed into a manufacturing center during the Industrial Revolution. During the 20th century, the state’s economy shifted from manufacturing to services, and in the 21st century it is a global leader in biotechnology, engineering, higher education, finance, and maritime trade.

Massachusetts was a site of early English colonization: the Plymouth Colony was founded in 1620 by the Pilgrims of the Mayflower, and in 1630 the Massachusetts Bay Colony, taking its name from the indigenous Massachusett people, established settlements in Boston and Salem. In 1692, the town of Salem and surrounding areas experienced one of America’s most infamous cases of mass hysteria, the Salem witch trials.In 1777, General Henry Knox founded the Springfield Armory, which, during the Industrial Revolution, catalyzed numerous important technological advances, including interchangeable parts.In 1786, Shays’ Rebellion, a populist revolt led by disaffected American Revolutionary War veterans, influenced the United States Constitutional Convention. In the 18th century, the Protestant First Great Awakening, which swept Britain and the Thirteen Colonies, originated from the pulpit of Northampton preacher Jonathan Edwards. In the late 18th century, Boston became known as the “Cradle of Liberty” for the agitation there that later led to the American Revolution.

Massachusetts has played a powerful scientific, commercial, and cultural role in U.S. history. Before the American Civil War, the state was a center for the abolitionist, temperance, and transcendentalist movements. In the late 19th century, the sports of basketball and volleyball were invented in the western Massachusetts cities of Springfield and Holyoke, respectively. Massachusetts has a reputation for social and political progressivism, becoming the first U.S. state, and one of the earliest jurisdictions in the world, to legally recognize same-sex marriage; Boston is considered a hub of LGBT culture and activism in the United States. Prominent American political dynasties have hailed from the state, including the Adams and Kennedy families.