The United States has methodically constructed a remarkably efficient and resilient national innovation system. This sustained endeavor has enabled the nation to successfully transcend its initial position as a technological follower, ultimately achieving and consolidating preeminent global leadership in innovation. Furthermore, the US has consistently reinforced its dominant standing within critical frontier scientific and technological domains on the world stage. A comprehensive longitudinal analysis of the trajectory underpinning the enhancement of this system’s overall functional efficacy reveals four distinct and consequential developmental phases. During the foundational formative stage, innovation activities were overwhelmingly propelled by private initiative and market dynamics, leading organically to the nascent emergence of the national innovation system’s fundamental architecture. The exigencies of World War II precipitated significantly heightened governmental engagement and strategic direction, decisively steering the system’s evolution towards a more organized, centrally coordinated framework aimed at enhancing collective output. Subsequently, spanning the prolonged Cold War era through the dawn of the 21st century, a deliberate and resource-intensive dual-track development strategy—simultaneously advancing military technological supremacy and robust civilian technological advancement—acted as the principal engine driving a comprehensive, multi-faceted elevation of the entire system’s aggregate efficiency and innovative capacity. Entering the 21st century, the strategic paradigm has demonstrably shifted towards an integrated focus on both cutting-edge scientific prowess and sustained economic competitiveness, viewed through the prism of intensifying great power rivalry. This reorientation necessitates and actively drives continuous dynamic adaptation and meticulous, ongoing optimization within the national innovation system, yielding demonstrable, steady gains in its overarching operational efficiency and global impact. This research critically examines the indispensable catalytic role played by governmental entities in orchestrating the construction, refinement, and functional augmentation of the national innovation ecosystem. Our analysis discerns that the demonstrable enhancement of the US system’s overall efficacy is fundamentally characterized by several interconnected pillars: the paramount importance of clear, forward-leaning strategic orientation providing decisive direction; the continuous, deliberate refinement of organizational and institutional architectures to maximize coordination and responsiveness; the systematic cultivation and nurturing of a vibrant, interconnected innovation ecosystem fostering collaboration and knowledge exchange; and the establishment of a robust, multi-layered policy framework offering sustained, foundational support. Furthermore, by scrutinizing emergent trends and strategic recalibrations within the contemporary US innovation landscape and assessing their profound potential ramifications under evolving global dynamics, this study extrapolates pertinent insights and proposes actionable countermeasures for augmenting the holistic efficacy of China’s national innovation system. Key recommendations encompass: intensifying proactive, strategically-aligned foresight exercises coupled with mechanisms for agile policy and resource adjustment; advancing the paradigm of organized, mission-oriented basic research, rigorously aligned with both long-term strategic imperatives and pressing societal/industrial needs; accelerating the development of a high-performance innovation ecosystem distinguished by the seamless, frictionless flow and optimal allocation of critical talent, capital, knowledge, and infrastructural resources; and systematically enhancing the coherence and comprehensiveness of the integrated innovation policy support system to provide holistic, effective underpinning.