Boston is in the United States.
Boston . It was the scene of several key events of the American Revolution , such as the Boston Massacre , the Boston Tea Party , the Battle of Bunker Hill , and the Siege of Boston . The city has one of the highest costs of living in the United States as it has undergone gentrification , though it remains high on world livability rankings . United States . The capital is Washington , D.C. , and the largest city is New York City ; nine other major metropolitan areas -- each with at least 4.5 million inhabitants and the largest having more than 13 million people -- are Los Angeles , Chicago , Dallas , Houston , Philadelphia , Miami , Atlanta , Boston , and San Francisco .