The list of buildings
A Manufacturing Plant increases shield production in its city by 50%. Note that manufacturing plants produce pollution. A Factory is required to build a Manufacturing Plant.
Manufacturing plants are large industrial complexes that produce goods of all types, although they are generally used to produce durable consumer goods such as automobiles. Essentially, a manufacturing plant is a large, sophisticated factory that employs specialization of labor, complex machinery, and assembly lines to gain efficiency and economies of scale. This combination of manpower and automation increases productivity and reduces production costs.