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Mutual Defense Treaty
Mutual Defense Treaty Between the Republic of the Philippines and the United States of America
Type Military alliance
Signed August 30, 1951 (1951-08-30)
Location Washington D.C., United States
Parties  Philippines
 United States
Language English

The Mutual Defense Treaty between the Republic of the Philippines and the United States of America was signed on August 30, 1951, in Washington, D.C. between representatives of the Philippines and the United States. The overall accord contained eight articles and dictated that both nations would support each other if either the Philippines or the United States were to be attacked by an external party.


The Philippines became a colony of the United States following the Spanish–American War and the subsequent Philippine–American War. In 1935, under the terms of the Tydings–McDuffie Act, the Philippines became a self-governing commonwealth, the Philippine Commonwealth, with full independence planned for ten years later. Delayed by World War II and the Japanese invasion and occupation of the Philippines, the Philippines became fully independent on July 4, 1946.[1] Following independence there remained in the Philippines a strong American military presence including a number of United States military bases in the Philippines, all allowed by treaties between the newly independent Philippines and the United States. There were also a number of treaties that created a strong bond between the Philippines and the United States which gave both countries rights not enjoyed by other nations. The Mutual Defense Treaty Between the Republic of the Philippines and the United States of America was signed on August 30, 1951, in Washington, D.C. between representatives of the Philippines and the United States.[2]


The overall accord contains eight articles and dictates that both nations would support each other if either the Philippines or the United States were to be attacked by an external party.[2]

As stated in Article I of the treaty, each party is to settle international disputes in a peaceful manner so that the international peace is not threatened, and to refrain from the threat of the use of force in any manner that is inconsistent with the purpose of the United Nations.[2] Article II states that each party either separately or jointly through mutual aid may acquire, develop and maintain their capacity to resist armed attack. Article III states that from time to time the parties will consult one another through the use of their secretaries of state, foreign ministers or consuls in order to determine the appropriate measures of implementation.[2] The parties will also consult one another when either party determines that their territorial integrity, political independence or national security is threatened by armed attack in the Pacific.[2] Article IV states that an attack on either party will be acted upon in accordance with their constitutional processes and that any armed attack on either party will be brought to the attention of the United Nations for immediate action.[2] Once the United Nations has issued such orders, all hostile actions between the signatories of this treaty and opposing parties will be terminated.[2]

Article V defines the meaning of attack and its purpose which includes all attacks by a hostile power will be held as an attack on a metropolitan area by both parties or on the island territories under its jurisdiction in the Pacific or on its armed forces, public vessels or aircraft in the Pacific.[2] Article VI states that this treaty does not affect, impede, or shall not be interpreted as affecting the rights and obligations of the parties under the Charter of the United Nations.[2] Article VII states that the treaty shall be ratified in accordance with the constitutional processes set delineated by the Constitution of the United States and the Constitution of the Philippines.[2] Lastly, Article VIII stipulates that the treaty terms are indefinite until one or both parties wish to terminate the agreement. If the agreement is to be terminated, either party must give one year advance notice.[2]


Secretary of State Hillary Clinton featured with Philippine President Benigno Aquino (Left) taken while Secretary Clinton was speaking during her two-day visit to the Philippines as a part of President Obama's Partnership for Growth agreement which coincided with the 60th anniversary of the two nations Mutual Defense Treaty, November 17, 2011.

US Navy 080629-N-7730P-009 Armed Forces of the Philippines, Chief of Staff, Gen. Alexander B. Yano shares a handshake with Lt.j.g. Eduardo Vargas. Gen. Yano flew aboard USS Ronald Reagan (CVN 76)

After the fall of the Soviet Union and the decline of the threat of communism in the 1990s bilateral support for the mutual defense treaty has taken a roller coaster ride especially in the Philippines. Generally, the Philippine Government has remained favorable towards the treaty ever since its inception, more often coming to rely on the U.S. for its defenses as it has done ever since World War II. This was nonetheless more apparent during the Cold War given the numerous active U.S. Military bases in the Philippines. The most notable and controversial of these bases are Clark Air Force Base outside of metro Manila, and the U.S. Naval Station Subic Bay. The bases were garrisoned for nearly 40 years after the end of World War II until the early 1990s. In 1991 anti-US sentiment in the Philippines forced the Philippine Senate to reject a new base agreement treaty that subsequently forced the removal of all US forces from Philippine soil.[3] However, given the rise of global terrorism with the events of 9/11 and the subsequent economic rise and militant expansion of China, the United States has strengthened its ties to its Asian allies especially the Philippines.[4]

In its 60th anniversary year, in a ceremony held on November 11, 2011, on the deck of the U.S. guided missile destroyer USS Fitzgerald, docked in Manila, the two governments reaffirmed the treaty with the Manila Declaration. The declaration was signed by Philippine Foreign Secretary Alberto Del Rosario and U.S. Secretary of State Hillary Clinton. The declaration was a formal affirmation of defensive ties between the two countries that date back over a century.[5] The declaration states, in part:

The Republic of the Philippines and the United States reaffirm our shared obligations under the Mutual Defense Treaty. We expect to maintain a robust, balanced, and responsive security partnership including cooperating to enhance the defense, interdiction, and apprehension capabilities of the Armed Forces of the Philippines. The Republic of the Philippines and the United States of America today commemorate the 60th anniversary of the Philippines-U.S. Mutual Defense Treaty. On this historic occasion, we reflect on the rich history of our alliance and the continuing relevance of the treaty for peace, security, and prosperity in the Asia-Pacific region. We also reaffirm the treaty as the foundation of our relationship for the next 60 years and beyond.

The United States and the Philippines are bound by a deep and abiding friendship forged by a history of shared sacrifice and common purpose. The many Filipinos who bravely served side-by-side with American servicemen and women during World War II and the veterans of our two nations buried at the Manila American Cemetery in Fort Bonifacio bear testament to our profound and enduring bonds. These bonds are enriched by the presence in the US of over four million Filipinos and Filipino Americans, and in the Philippines by over 150,000 Americans, who help shape the political and economic future of both countries.[5]

In a followup to the signing of the Manila Declaration the U.S. and Philippine representatives met to sign onto a new partnership strengthening the economic and defensive ties of the two countries. This new formal agreement is the Partnership for Growth. This new agreement comes as a part of President Obama's Global development initiative which is designed to strengthen the Philippines business development and commercial ties between the two countries.[6] During the signing ceremony of this new agreement Secretary Clinton reaffirmed the U.S.'s position on the mutual defense of the Philippines through the statement "The US will always be in the corner of the Philippines. We will always stand and fight with you to achieve the future we seek".[7]

Official support for the treaty appears to be growing in the face of foreign threats and fears especially as they pertain to China. Under the Aquino Administration in the Philippines and the Obama Administration in the United States neither country appears to be giving any indication of weakening its economic or military ties to one another.


Evacuees board the USS Abraham Lincoln

Opposition to the U.S.-Philippine Mutual Defense Treaty has had its periods on both sides of the Pacific. Given the longevity of the U.S. Military presence in the Philippines opposition to the U.S. Military presence in the Philippines and the treaty itself began in the 1980s with the escalating tensions surrounding U.S. policy decisions and their repercussions.[8] The late 1970s and 1980s saw a rise in anti-US sentiment following the increasing allegations and perpetrations of U.S. military personnel misconduct towards Filipino men and women. The nightclubs and social hotspots surrounding Clark Air Force Base and Naval Base Subic Bay became flashpoints of allegations of assaults by U.S. service-members on the local Filipinos.[8] Political tensions steadily grew. In 1991 the Military Bases Agreement of 1947 were expiring and the George H. W. Bush Administration of the U.S. and the Corazon Aquino Administration of the Philippines were in talks to renew the agreement. A new treaty was drafted and the new "Treaty of Peace, Friendship and Cooperation" specified the renewal of the leases.[9] Anti-US sentiment continued to grow in the Philippines and it was reflected in the election of the Philippine Senate. The majority of the Philippine Senate were in opposition to Philippine President Aquino's Administrations treaty. On September 13, 1991, the Philippine Senate voted and refused to ratify it.[3] As a result, the last of the U.S. military personnel in the Philippines were removed from the bases on November 24, 1992.

The American flag is lowered and Philippine flag is raised during turnover of Naval Station Subic Bay

The opposition movement within the Philippines subsided after the removal of U.S. personnel from the Philippines in the early 90s. It never truly dissipated in its entirety however. Anti-US sentiment remained a prevalent social issue within the collegiate community in Metro Manila and relatively small anti-US demonstrations routinely took place outside the U.S. embassy until the early 2000s.[10] As a result of the unfortunate events surrounding 9/11 the U.S. began restructuring and exercising its rights of the U.S. Philippine Defense Treaty as a part of its War on Terrorism,[10] which included deployment of U.S. forces to the Philippines in Operation Enduring Freedom – Philippines to advise and assist the Armed Forces of the Philippines (AFP). As the U.S. military and Philippine Armed Forces began training and conducting anti-terrorist missions within the Philippine archipelago, anti-US sentiment slowly began to rise once again.

2014 Enhanced Defense Cooperation Agreement[]

On April 28, 2014, desiring to enhance cooperative capacities and efforts in humanitarian assistance and disaster relief, the two governments executed an Enhanced Defense Cooperation Agreement (EDCA).[11] The EDCA is designed to promote the following between the Philippines the United States:

  • Interoperability
  • Capacity building towards AFP modernization
  • Strengthening AFP for external defense
  • Maritime Security
  • Maritime Domain Awareness
  • Humanitarian Assistance and Disaster Response (HADR)

The agreement allows U.S. forces access to and use of designated areas and facilities owned and controlled by the Armed Forces of the Philippines at the invitation of the Philippine Government. It contains clear provision that the U.S. will not establish a permanent military presence or base in the Philippines and a prohibition of entry to the Philippines of nuclear weapons.[12] The EDCA has an initial term of ten years, and thereafter will continue in force until terminated by either party after having given a one-year notice of intention to terminate.[11]


  1. "Republic of the Philippines". U.S. Department of State. Retrieved 2012-02-18. 
  2. 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 "Mutual Defense Treaty Between the United States and the Republic of the Philippines". Chan Robles Law Library. Retrieved 2012-11-04. 
  3. 3.0 3.1 "Philippine Senate Votes to Reject U.S. Base Renewal". Retrieved 2012-04-15. 
  4. "CRS Report for Congress:U.S. Strategic and Defense Relationships in the Asia-Pacific Region". Congressional Research Services. Retrieved 2012-04-16. 
  5. 5.0 5.1 "Signing of the Manila Declaration". Department of State. Retrieved 2012-04-15. 
  6. "IGD Policy Perspectives". Initiative For Global Development. Retrieved June 15, 2012. 
  7. "Clinton Vows Greater Support for Philippine Defense". Retrieved 12 April 2012. 
  8. 8.0 8.1 O'Connor, Brendon; Griffiths, Martin (2007). Anti-Americanism in the Philippines. ISBN 9781846450266. Retrieved 2012-04-15. 
  9. "Security Relations and Institutionalism in Southeast Asia". University of California at Berkeley. Retrieved 2012-04-15. 
  10. 10.0 10.1 "US Military Operations in the War on Terrorism". Congressional Research Service. Retrieved 2012-04-15. 
  11. 11.0 11.1 "Document: Enhanced Defense Cooperation Agreement". Official Gazette. Government of the Philippines. April 29, 2014. 
  12. "Q&A on the Enhanced Defense Cooperation Agreement". Official Gazette. Government of the Philippines. 

External links[]

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