Why did scientific study of control systems expand after World War II?

The scientific study of control systems expanded significantly after World War II due to the urgent demand for advanced military technologies and the subsequent emergence of complex, large-scale systems.123

During the war, the development of sophisticated applications—such as anti-aircraft batteries and fire-control systems—highlighted the necessity for a more rigorous theoretical framework for control. Following the war, this momentum continued with projects like the Nike Ajax missile system, which required an integrated systems engineering approach to balance complex variables like trajectory, maneuverability, and range.143

The post-war era also saw the advent of digital computers, which provided the computational power to analyze and simulate increasingly complex, multiple-loop systems. These advancements, coupled with the Cold War drive for coordinated defense networks, shifted the field from simple, single-loop feedback mechanisms to the broader, mathematically oriented discipline of control theory. By the late 1950s and early 1960s, this evolution allowed for the formalization of "modern control," characterized by the use of state-space models and optimization techniques to manage complex dynamical systems.1325