The relationship between the United States and Portugal has evolved from early diplomatic ties to a cooperative and strategic partnership rooted in defense, economic collaboration, and shared democratic values. While ideological and geopolitical factors have occasionally caused tensions, the overall relationship remains cooperative, with elements of mutual dependency, particularly in matters of security.
Portugal was the first neutral nation to recognize the United States’ independence in 1778, establishing diplomatic relations that have endured for over two centuries. The early 20th century saw continued alignment, particularly during World War II, when the U.S. and Britain leveraged Portugal’s strategic position, particularly the Azores, for military operations. However, tensions emerged during the Cold War due to U.S. opposition to Portugal’s colonial policies in Africa. The Kennedy administration, for instance, restricted arms sales to Portugal in 1961 due to its resistance to decolonisation, but this stance softened as the Azores became indispensable to NATO operations.
Following the 1974 Carnation Revolution and Portugal’s decolonisation, relations stabilised. Portugal’s integration into NATO, as a founding member in 1949, and later the European Economic Community in 1986, reinforced its role as a Western ally. The U.S. facilitated Portugal’s democratic transition by fostering economic and defense cooperation.
The political relationship between the two countries has been largely cooperative, particularly within the NATO framework. The Lajes Air Base in the Azores remains a vital asset for U.S. and NATO military operations, underscoring Portugal’s strategic importance (U.S. Department of State, n.d.). In recent years, Portugal has strengthened its military collaboration with the United States, joining the National Guard Bureau’s State Partnership Program in 2025, underscoring the ongoing security cooperation.
However, divergences in foreign policy occasionally arise. Portugal’s criticism of the 2003 Iraq War demonstrated its willingness to act independently of U.S. directives. Despite these differences, defense and security ties have remained resilient, with both countries committed to Euro-Atlantic security. “At the political level, Portugal stands as a fierce supporter of Atlanticism that serves not only as a multiplier of national interests but as a bridge between the North and South Atlantic. It is expected that the intertwining between EU and NATO’s engagement will be at the core of Portuguese orientations in the Atlantic at large, enacting its unique strategic location in this geography” (Camisão & Fernandes, 2025, p.163).
Economic relations between Portugal and the United States have been shaped by trade, investment, and a robust Portuguese-American diaspora, which exceeds 1.3 million people, fostering bilateral engagement (Azevedo et al., 2023). U.S. investments in Portugal, particularly in the technology sector, have grown significantly, and Portugal’s economy benefits from trade agreements within the broader European framework.
Portugal’s economic policies align more closely with those of the European Union than with those of the United States, particularly in terms of regulatory frameworks, social welfare, and trade policies. However, transatlantic trade remains strong, and Portugal has sought to expand economic ties with the U.S. in recent years.
Public opinion in Portugal generally views the United States as a crucial ally, but historical factors, European integration, and domestic political developments shape nuanced perceptions. The European Union remains Portugal’s primary political and economic reference point, but the U.S. is seen as a key strategic partner.
The U.S.-Portugal relationship can be best described as cooperative with elements of dependency. While Portugal retains autonomy in its foreign policy decisions, its strategic reliance on U.S. defense commitments, particularly within NATO, creates an asymmetrical power dynamic. At the same time, Portugal’s deep integration into the European Union provides it with economic and political leverage, preventing complete dependency on the U.S.
Despite occasional policy disagreements, Portugal and the U.S. share strong diplomatic, military, and economic ties. The relationship thrives on pragmatic cooperation, making it a stable and mutually beneficial partnership rather than a confrontational or entirely dependent alliance.
References
Azevedo, A. B. (Coord.), Malheiros, J., Silva, K., Tavares, L. P., Garha, N. S., & Ferreira, P. M. (2023). Imigrantes e lusodescendentes nos EUA no século XXI. Fundação Luso-Americana para o Desenvolvimento. https://www.flad.pt/wp-content/uploads/2023/06/FLAD-ICS-Imigrantes-e-Lusodescendentes-nos-EUA-no-Seculo-XXI.pdf
Magalhães, P. C., Silva, P., & Monteiro, N. (2025). Portugal in the 21st Century. Routledge.
Camisão, I., & Fernandes, S. (2025). Portugal in the European Union. In N. Monteiro, P. Silva, & P. C. Magalhães (Eds.), Portugal in the 21st century (Chapter 10). Routledge. https://doi.org/10.4324/9781003488033-10
U.S. Department of State. (2025). U.S.-Portugal Relations. Retrieved from https://www.state.gov/u-s-relations-with-portugal/.
XXIV Governo Constitucional. (2025, January 13). Ministro da Defesa e Embaixadora dos Estados Unidos anunciam parceria entre as Forças Armadas e a National Guard. Governo de Portugal. Retrieved from https://www.portugal.gov.pt/pt/gc24/comunicacao/comunicado?i=ministro-da-defesa-e-embaixadora-dos-estados-unidos-anunciam-parceria-entre-as-forcas-armadas-e-a-national-guard