By Derek Grossman
In 2026, the Philippines assumed the Chairship of the Association of Southeast Asian Nations (ASEAN) at a moment of profound geopolitical flux. The Indo-Pacific is more multipolar, more contested, and more strategically consequential than at any time since the end of the Cold War.
Yet amid this uncertainty, one constant endures: the alliance between the Philippines and the United States.
As the Philippines and the United States commemorate eight decades of diplomatic partnership and 75 years of treaty alliance, the ironclad bond between the two democratic nations could not be more evident. The alliance is not merely a legacy of history. It is an adaptive institution — tested by crisis, recalibrated by politics, and strengthened by shared purpose. From its formalization in the 1951 Mutual Defense Treaty (MDT) to its modern evolution under the Enhanced Defense Cooperation Agreement (EDCA) and heightened economic partnership in the Pax Silica, the relationship has demonstrated a rare durability. Its endurance is not accidental. It is by design and structural.
Across eight decades, four pillars explain why the Philippines–United States alliance remains resilient, mature, indispensable, and forward-looking.
Pillar I: Historical Resilience and Endurance
How has this relationship remained durable through war, political transition, economic crisis, domestic turbulence, and shifting strategic landscapes?
The answer lies in institutional architecture and shared strategic logic. The 1951 Mutual Defense Treaty created more than a security guarantee—it established a legal framework capable of adaptation to the times. Throughout the Cold War, the alliance anchored American presence in Southeast Asia while providing Manila with security assurance during a period of regional volatility and global uncertainty.
The relationship faced its most dramatic test in 1991, when the Philippine Senate voted not to renew U.S. basing rights. Many observers predicted a terminal rupture. Instead, the alliance recalibrated. Within a decade, a renewed sense of purpose and trust between the parties was restored which led to cooperation in the 1998 Visiting Forces Agreement, thus restoring interoperability and legal clarity for joint exercises. In 2014, EDCA paved the way to institutionalized rotational presence, infrastructure development, and prepositioning—without permanent basing.
Rather than collapse under strain, the alliance demonstrated elasticity guided by a strong commitment to a common vision and mission.
External shocks repeatedly reinforced this structural logic. Counterterrorism cooperation after 9/11 deepened operational coordination. Maritime tensions in the South China Sea sharpened the alliance’s deterrence function. Natural disasters—such as Typhoon Haiyan—showcased humanitarian and disaster relief cooperation as a stabilizing force beyond traditional defense.
Beyond security, the alliance has consistently shown its true “Two-Way Street” dynamism. America has benefited immensely from a strong Philippines through:
- Services & People-to-People: The vital role of Filipino healthcare professionals and teachers in the U.S., as well as the evolution into high-value IT and knowledge services that now power much of the U.S. digital economy.
- Economic Gains: Stronger supply chain resiliency, particularly in semiconductors and clean energy cooperation (via the 123 Agreement).
- Civilian Cooperation: The longstanding presence of USAID and NGOs, as well as institutional support for peace and inclusive governance in the Bangsamoro Autonomous Region in Muslim Mindanao (BARMM), such as USAID’s Marawi Response Project and Forward Mindanao.
- Secure AI and semiconductor supply chains: On April 16, the Philippines was invited to and joined the U.S.-led Pax Silica initiative. Manila announced the allocation of 4,000 acres to establish a transformative industrial zone in New Clark City within the Luzon Economic Corridor that will serve as the “Golden Node” of Pax Silica. The U.S., along with like-minded partner Japan, will collaborate with the Philippines to transform New Clark City into an AI and logistics hub that will accelerate investment in critical minerals, semiconductors, and AI technology.
The alliance recently demonstrated continuity through new major investments—like the 2025 Health Security Package and the Philippines Enhanced Resilience Act (PERA)—which appear in the US National Defense Authorization Act (NDAA) for 2026. These packages demonstrate how aid remains a vital, modern pillar of the relationship.
The pattern is consistent: political friction arises; strategic necessity reasserts itself; institutional mechanisms absorb the shock.
This is not a brittle alliance sustained by sentiment. It is an architecture of stability built to adapt.
Pillar II: Evolution into a Mature Partnership
The Philippines–United States relationship has undergone profound transformation since the early twentieth century. What began in asymmetry has matured into strategic reciprocity.
In its early decades, the security relationship reflected post-war dependency. Over time, however, Philippine agency expanded. Democratic transitions, constitutional reform, and defense modernization gradually reshaped the alliance from guarantor-client dynamics into cooperative partnership.
Today, interoperability is not symbolic—it is operational. Joint military exercises such as Balikatan demonstrate combined planning, maritime domain awareness integration, and advanced warfighting coordination. The Armed Forces of the Philippines (AFP) are undergoing sustained modernization, investing in coastal defense systems, naval assets, and surveillance capabilities that enhance both national defense and alliance credibility.
The alliance now reflects shared operational space rather than unilateral provision of security. Importantly, this maturation extends beyond military dimensions. Economic ties, diaspora connections, educational exchanges, and robust political engagement underpin the relationship.
The alliance rests on democratic institutions in both countries, supported by people-to-people bonds that have endured across generations. Indeed, our people-to-people ties date back as early as the 18th century—even before the official
founding of the American republic. At that time, Filipino diaspora were already in what was then Spanish territory in the U.S. long before the country was born, contributing to the fabric ofAmerica. These so-called Filipino “Manilamen” were establishing communities in the bayous of Louisiana (Saint Malo). This shared history serves as a “living bridge” that adds depth and soul to the U.S.-Philippines alliance.
What defines the partnership at 80 is not nostalgia—it is parity of purpose.
The Philippines does not serve as a passive beneficiary of American protection. It is an active contributor to regional stability. The United States does not dictate strategy; it coordinates with a sovereign partner whose geography, capabilities, and diplomatic role are central to Indo-Pacific equilibrium.
Pillar III: The Philippines as an Indispensable Anchor
In a multipolar Indo-Pacific shaped by major power competition, supply chain vulnerability, maritime contestation, and emerging technologies, geography matters. And few geographies matter more than the Philippine archipelago.
Straddling critical sea lanes for shipping and trade, and occupying a central position along the First Island Chain, the Philippines sits at the strategic crossroads of Northeast and Southeast Asia. Stability in the Philippine maritime domain directly affects regional trade, energy flows, and deterrence dynamics.
A modernized and self-reliant Philippines anchors American interests not by dependency, but by strength.
As Manila invests in coastal defense, air and maritime modernization, and enhanced domain awareness, it contributes to distributed deterrence across the Indo-Pacific. The Philippines has a vital role in preserving security and actively promotes alliance “burden-sharing” that involves a sustained commitment of significant resources and manpower. A capable Philippines complicates aggression, reduces miscalculation, and enhances crisis management.
This anchoring role is not directed against any one actor; it is directed toward preserving regional balance and order guided by maritime laws and a rules-based regime.
A stronger Philippines benefits not only the United States, but also Japan, Australia, South Korea, and fellow ASEAN members. It reinforces maritime transparency, supports international law, and upholds the principles embedded in the United Nations Convention on the Law of the Sea (UNCLOS) and the Manila Declaration on the Peaceful Settlement of International Disputes.
Crucially, Philippine self-reliance enhances alliance credibility. When national defense capacity rises, alliance cooperation becomes mutually reinforcing rather than asymmetric. The alliance is strongest when the Philippines is strongest. In this sense, Manila is not merely a participant in Indo-Pacific strategy—it is an indispensable anchor.
Pillar IV: Future Vision and ASEAN Centrality
As ASEAN in 2026, the Philippines also enters its ninth decade of U.S. alliance with renewed purpose.
ASEAN centrality remains the cornerstone of Southeast Asia’s diplomatic architecture. The Philippines’ chairship presents an opportunity to demonstrate that bilateral alliances and regional multilateralism are complementary, not contradictory.
A confident Philippines can leverage alliance-enabled capabilities to strengthen ASEAN-led mechanisms, including the ASEAN Regional Forum and East Asia Summit processes. Maritime capacity building, humanitarian assistance coordination, cyber resilience, and supply chain security all benefit from enhanced Philippine capabilities.
The future – and growth – of the alliance is therefore grounded on regional, not merely bilateral, relations.
Rather than over-securitizing ASEAN, the Philippines can position itself as a steward of rules-based order, economic resilience, and inclusive dialogue. Alliance modernization enables Manila to lead credibly—projecting stability without undermining ASEAN cohesion.
The Indo-Pacific’s complexity demands layered security structures. Bilateral alliances, minilateral cooperation, and ASEAN multilateralism together form a stabilizing network. The Philippines sits at the intersection of these frameworks.
In collaboration with the United States and Japan, the Philippines is leveraging its unique and strategic geographic advantages to develop the Luzon Economic Corridor, which will spur advances in technology, cyber security, and energy as well as enhance regional economic resilience. This is a concrete example of the centrality the Philippines is playing in key alliances and partnerships throughout the region.
The bottom line is that at 80, the U.S.-Philippines alliance is not retrospective. It is preparatory.
Conclusion: Adaptation as the Source of Strength
The Philippines–United States alliance has endured not because it avoided crisis, but because it adapted to crisis.
It survived decolonization, Cold War realignment, base closures, domestic political shifts, counterterrorism campaigns, and maritime disputes. Each challenge reshaped the relationship, but none dismantled it. Institutional flexibility, shared democratic values, strategic geography, and evolving military capability have together produced an alliance that is elastic rather than brittle.
As the Philippines carries out its ASEAN chairmanship, the alliance enters a new chapter—one defined by mutual strategic necessity and shared regional vision. A resilient Philippines strengthens ASEAN. A stable ASEAN strengthens the Indo-Pacific. And a durable alliance reinforces them both.
Eighty years on, the Philippines–United States partnership stands not as a relic of the past, but as a living architecture of stability—tested by time, matured by experience, and prepared for the challenges of a multipolar century.
The alliance’s greatest achievement is not that it has lasted. It is that the U.S.-Philippines alliance continues to evolve—and it does so with a steady determination to secure our shared future.
Having such a longstanding, strong, and dynamic alliance will certainly help America and the Philippines meet the opportunities and challenges of both today…and tomorrow.