Is Boston in Massachusetts or New York?

Excuse me, but I have a question that's been bugging me for a while. Could you clarify for me if Boston is actually located in the state of Massachusetts, or is it perhaps in New York? I've heard conflicting information on this, and I'm just trying to get a definitive answer. I understand that Boston is a major city in the Northeastern United States, but I'm a bit unsure about its precise state location. Could you shed some light on this for me?