Why is Manhattan larger today than it was in the 1600s?

Manhattan is larger today than it was in the 1600s primarily due to land reclamation and urban development. Over the centuries, large sections of the shoreline were extended into the Hudson and East Rivers through the addition of landfill. This expansion allowed for the construction of buildings, parks, and infrastructure, significantly increasing the island's usable area. Additionally, the growth of the city’s population and economy has driven the need for more land, leading to further development and expansion.