Which of the following towns was a major seaport in the Middle Colonies?

Philadelphia was a major seaport in the Middle Colonies due to its strategic location along the Delaware River, which provided easy access to the Atlantic Ocean. During the colonial period, Philadelphia emerged as a key hub for trade and commerce, facilitating the transport of goods, including agricultural products and manufactured items. The city not only served as a center for shipping but also became one of the largest cities in the colonies, attracting immigrants and contributing to its growth as a commercial powerhouse.

In contrast, other options represent significant ports but are located in different regions. Boston, for example, is associated with New England, Charleston is a vital port for the Southern colonies, and Richmond is an inland city rather than a coastal seaport. Therefore, Philadelphia's role as a major seaport in the Middle Colonies solidifies its historical importance in the context of colonial trade.