This article examines democratization as an aspect of human development: human development progresses when people attain greater autonomous choice in shaping their lives. Democratization promotes this process in so far as it institutionalizes freedom of choice based on civil and political liberties. This perspective allows one to integrate modernization-based explanations and civic culture-based explanations of democratization under a common theoretical umbrella. Both types of explanations re?ect aspects of human development. Modernization provides socioeconomic resources that increase people’s capabilities to act in accordance with their autonomous choices; and the rise of a civic culture promotes postmaterialist values that increase people’s emphasis on autonomous choices. Linked through their common focus on autonomous human choice, socioeconomic resources and postmaterialist values provide overlapping sources of pressure for the growth of freedom. Within the limits set by the extent to which freedom is not yet present, socioeconomic resources and postmaterialist values are conducive to the growth of political freedom in interchangeable ways. These hypotheses are tested against the massive wave of democratization processes that occurred from the 1980s to the 1990s, using data from 62 nations of the World Values Surveys. We ?nd that democratization is driven by social forces that focus on the growth of autonomous human choice, re?ecting human development. From this perspective, modernization-based and civic culture-based explanations of democratization are manifestations of the same theme: the expansion of autonomous human choice.