In the period immediately following World War II the plateau remained agricultural.
Primary industry, almost entirely agriculture, accounted for 63% of economic activity, secondary accounted for 12%, and tertiary 25%.
Post-war industrial planning resulted in large-scale development of coastal areas on the eastern Shimōsa Plateau along Tokyo Bay.
Fishing and agricultural areas along the bay were replaced by landfill.
The scenery of the eastern plateau went from largely agricultural to a vast area of factory smokestacks and high-rise housing.
The development of sprawling port facilities, originally centered on the city of Chiba, culminated in the establishment of Keiyō Industrial Zone.
Manufacturing facilities were developed across the central Shimōsa Plateau in the same period.

Immediately after World War II, the transportation system of northern Chiba Prefecture was significantly improved.
The rail network connecting northern Chiba Prefecture to Tokyo was expanded, allowing the construction of large-scale housing facilities, and northern Chiba Prefecture became a bedroom community of metropolitan Tokyo.
The construction of Narita International Airport between 1972 and 1978 resulted in further economic development and population increase on the central Shimōsa Plateau.

In contrast to the large-scale economic development of the western and central Shimōsa Plateau, other parts of Chiba Prefecture saw relatively little economic development and ultimately long-term population decline, notably on the eastern Shimōsa Plateau, the Kujūkuri Plain, and entirety of the southern Bōsō Peninsula.
In the period immediately following World War II the plateau remained agricultural. Primary industry, almost entirely agriculture, accounted for 63% of economic activity, secondary accounted for 12%, and tertiary 25%. Post-war industrial planning resulted in large-scale development of coastal areas on the eastern Shimōsa Plateau along Tokyo Bay. Fishing and agricultural areas along the bay were replaced by landfill. The scenery of the eastern plateau went from largely agricultural to a vast area of factory smokestacks and high-rise housing. The development of sprawling port facilities, originally centered on the city of Chiba, culminated in the establishment of Keiyō Industrial Zone. Manufacturing facilities were developed across the central Shimōsa Plateau in the same period.
Immediately after World War II, the transportation system of northern Chiba Prefecture was significantly improved. The rail network connecting northern Chiba Prefecture to Tokyo was expanded, allowing the construction of large-scale housing facilities, and northern Chiba Prefecture became a bedroom community of metropolitan Tokyo. The construction of Narita International Airport between 1972 and 1978 resulted in further economic development and population increase on the central Shimōsa Plateau.
In contrast to the large-scale economic development of the western and central Shimōsa Plateau, other parts of Chiba Prefecture saw relatively little economic development and ultimately long-term population decline, notably on the eastern Shimōsa Plateau, the Kujūkuri Plain, and entirety of the southern Bōsō Peninsula.
Shimōsa Plateau