This paper examines the long-term impact of the Truman Doctrine on the Soviet Union, arguing that the doctrine, while intended to contain Soviet expansion, inadvertently contributed to internal systemic strains that ultimately played a significant role in the USSR's collapse. We analyze how the constant pressure of the Cold War, fueled by the Truman Doctrine's policy of containment, forced the Soviet Union into an unsustainable arms race and ideological rigidity, diverting resources from crucial sectors such as consumer goods and technological innovation. Furthermore, we explore how the doctrine's emphasis on supporting anti-communist regimes, even those with authoritarian tendencies, created a complex geopolitical landscape that further strained Soviet resources and credibility. By tracing the historical trajectory from the Truman Doctrine to the eventual dissolution of the Soviet Union, this study sheds light on the unintended consequences of Cold War policies and the intricate interplay of external pressure and internal vulnerabilities in shaping historical outcomes. The paper also addresses the role of internal dissent and economic stagnation within the Soviet Union, arguing that these factors were exacerbated by the external pressures engendered by the Truman Doctrine and the broader Cold War context. Finally, we assess the historiographical debates surrounding the collapse of the Soviet Union, considering various perspectives on the relative importance of internal and external factors.