Over the past decade, Stoicism has experienced a resurgence in American popular culture, largely attributed to the perceived challenges facing both the nation and the world. However, despite the significant role of patriotism in contemporary American culture and politics, this topic is rarely discussed by modern Neostoics. Justus Lipsius, the sixteenth-century founder of Neostoicism, stands as a notable exception. In his 1584 philosophical work De Constantia in Publicis Malis (On Constancy in Times of Public Calamity), Lipsius delineates and analyzes the necessity to moderate three emotions that directly contradict constancy (defined as “an upright and unmovable strength of the soul”) and contribute to fervent and often detrimental patriotism: pretense, piety, and pity. Lipsius argues that these three emotions must be restrained to uphold the Stoic virtue of temperance. This essay examines the relevance of Lipsius’ analysis and critique of fervent patriotism by grounding it in American historical instances of its potential for adverse outcomes, including McCarthyism, Japanese internment, the KKK, and more recently, the invasion of Iraq and the January 6th riot. By analyzing the arguments presented in De Constantia, it is possible to draw inferences about how Lipsius’s beliefs may be incorporated into contemporary American Neostoicism and address the question of Stoic citizenship, particularly within modern contexts. This analysis encourages a reassessment of ancient philosophical frameworks for understanding contemporary political and social phenomena.