Introduction: Research in support of terror management theory suggests that mortality concerns will activate symbolic defenses associated with cultural worldviews, and when these defenses are activated, mental health will benefit. However, no study to date has examined this process in full. We filled this gap, while testing the moderating effect of feeling successful vis-à-vis cultural value-standards. Method: In two studies, we hypothesized that participants who feel successful at meeting cultural standards would engage cultural worldview defense (WVD) following mortality salience (MS), and as a consequence of their defensiveness, would experience greater mental health. Results: In Study 1, MS increased pro-American WVD only among relatively wealthy participants, which in turn reduced death-thought accessibility. In Study 2, MS increased pro-American WVD only among participants primed with felt success (vs. failure), which in turn reduced anxiety and depression. Conclusions: Culture can relieve death-related distress and promote mental health to the extent that it provides feelings of success.