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Boston is the capital and most populous city of Massachusetts with a population of 675,647 as of the 2020 census, serving as the cultural and financial center of New England in the Northeastern United States. Founded on Shawmut Peninsula in 1630 by English Puritan settlers led by John Winthrop and named after Boston, Lincolnshire in England, the city played a pivotal role in American independence through events including the Boston Massacre (1770), Boston Tea Party (1773), and the Siege of Boston (1775-1776). Boston established numerous national firsts including the first public park (Boston Common, 1634), first public school (Boston Latin School, 1635), and first subway system (Tremont Street subway, 1897), and has since emerged as a global leader in higher education, biotechnology, and research. The city's economy is led by finance, professional services, information technology, and government, with nearly 5,000 startup companies making it a global pioneer in innovation, entrepreneurship, and artificial intelligence. The Greater Boston metropolitan area has a population of 4.9 million as of 2023, ranking it as the eleventh-largest metropolitan area in the United States. Cambridge, Massachusetts is a city in Middlesex County located directly across the Charles River from Boston, with a 2020 population of 118,403 making it the fourth-largest city in Massachusetts and ninth-most populous in New England. Founded in December 1630 during the colonial era, Cambridge played a pivotal role in the American Revolution when approximately 16,000 American patriots assembled at Cambridge Common in May 1775, and George Washington arrived there on July 2, 1775, to command the Continental Army, making it the birthplace of that military force. The city is home to Harvard University, founded in 1636 as the oldest institution of higher learning in the United States, and the Massachusetts Institute of Technology (MIT), which operates a 168-acre campus there. Kendall Square, near MIT, has been called "the most innovative square mile on the planet" and hosted over 250 biotech companies by 2022, with more than 120 concentrated in the Kendall Square ZIP Code since 2010. Cambridge was named in honor of the University of Cambridge in England, reflecting the Puritan theology of the town's founders. Brookline is a town in Norfolk County, Massachusetts, part of the Boston metropolitan area, with a 2020 census population of 63,191. First settled by European colonists in 1638 as the hamlet of Muddy River and incorporated as an independent town in 1705, Brookline is best known as the birthplace of U.S. President John F. Kennedy and comedian Conan O'Brien. The town became an exclave of Norfolk County after neighboring towns West Roxbury and Hyde Park were annexed by Boston in 1874 and 1912, respectively, and is divided by Massachusetts Route 9 (Boylston Street) into urban northern and less developed southern sections served by the MBTA's Green Line. Frederick Law Olmsted integrated Brookline's Muddy River into the Emerald Necklace of parks and parkways in the 1890s, establishing parkland shared by both Boston and Brookline residents. The town resisted Boston annexation throughout its history, most notably in an 1873 referendum, and has long been regarded as a verdant, pleasant environment known for its picturesque lanes and cottage neighborhoods.