Final answer:
Boston is the answer to the question as it is the city that undertook significant land reclamation from 1630 to 1890 by filling in areas like Mill Pond and Back Bay.
Step-by-step explanation:
From 1630 to 1890, new land was created in the city of Boston by filling in nearby bodies of water, including Mill Pond and Back Bay. This land reclamation was part of an urban development project that expanded the city's area significantly. The most notable areas of expansion are the neighborhoods of the Back Bay and the South End, which were once tidal flats but have since been filled in. This process of adding land to the city over several centuries allowed Boston to accommodate the booming industrial growth and population influx that characterized the 19th century.