The question asks to identify the sociologist who described 'bordered power containers' as a defining characteristic of modern nation-states.

Identifying Bordered Power Containers Theorist

Sociologist Anthony Giddens proposed the concept of 'bordered power containers'. He argued that modern nation-states are characterized by their ability to exert control within clearly defined geographical boundaries. This concept highlights the state's capacity for surveillance and administration over its territory and population, distinguishing modern states from earlier forms of political organization.

Giddens' Contribution to State Theory

Anthony Giddens identified several key features of the modern state, including its administrative control, economic development, and the monopolization of the means of violence. The idea of 'bordered power containers' specifically emphasizes the territorial aspect and the state's role as a container managing power within these borders.

Therefore, Anthony Giddens is the theorist credited with defining 'bordered power containers' as a crucial feature of modern nation-states.