Final answer:
The approach to social welfare between the Second World War and the 1970s was collective and interventionist, reflecting an ideology that emphasized societal responsibility and government regulation and provision of social services to support economic and social stability.
Step-by-step explanation:
Between the Second World War and the 1970s, the approach to social welfare in many Western countries shifted towards a model that emphasized a collective responsibility to its citizens. This period saw the implementation of wide-ranging social programs designed to provide a safety net and ensure some level of equity in a society based on competitive, free-market economics. The model was collective because it focused on broader societal responsibility rather than individual provision, and it was interventionist due to the active role played by the state in regulating and providing welfare services. Thus, compared with before and after this period, the underlying ideology was more collective: interventionist.
During the Great Depression, the fear that high unemployment and low-income levels could threaten the stability of democracy led to the beginning of federal social welfare policies. By the 1960s, social welfare had become a major function of the federal government, aiming to minimize poverty, stimulate the economy, and prevent broader economic depressions. These policies reflected a liberal worldview which prioritized providing social welfare programs to support the good of the international system.