Аннотация:How can political scientists best uncover historical causation without committing infinite regress? This article introduces a revised framework for historical analysis that can help systematically capture the deepest causal factors in political development. It improves on the familiar “critical juncture” framework by specifying the precise causal or noncausal status of the “antecedent conditions” preceding critical junctures. After disaggregating antecedent conditions into four logical types, the authors argue that scholars should be especially mindful of critical antecedents: factors or conditions preceding a critical juncture that combine in a causal sequence with factors operating during that juncture to produce divergent outcomes. Through analytic reviews of a wide array of major works, the authors illustrate how critical antecedents can clarify causal claims and enhance knowledge accumulation in comparative politics.