A historian would most likely use the term collectivization for a study of developments in which country during the 1930s?

The term "collectivization" is most notably associated with the policies implemented in the Soviet Union during the 1930s under Joseph Stalin. This process involved the consolidation of individual peasant farms into large, state-controlled collective farms. The aim was to increase agricultural production and facilitate the mechanization of farming. The policy was part of a broader effort to transform the Soviet agricultural landscape and was often enforced through severe measures, including the repression of kulaks (wealthier peasants) and significant social upheaval.

In the context of the 1930s, while other countries were experiencing various economic and political changes, such as the rise of extremism in Germany or the Great Depression in the United States, "collectivization" specifically refers to the unique and radical agricultural reforms undertaken in the Soviet Union. Understanding this historical context helps clarify why this term would be most appropriately linked to the developments in that country during that decade.