
The coastal defensive landscape of the late 1940s is starkly visible in this regional study, which highlights a dense network of harbor fortifications protecting Boston. Batteries and military installations like Fort Independence, Fort Warren, and Fort Revere line the approach to the city through Massachusetts Bay and Broad Sound. This era reveals a Massachusetts interior defined by mature industrial hubs and integrated infrastructure, where the Merrimack River supports the manufacturing centers of Lowell and Haverhill while the Wachusett Reservoir serves as a critical hydrological anchor for the growing metropolitan region.
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