archipelagos has historically made it particularly keen to adapt to the policy of whichever
great power dominates Atlantic sea lanes, often perceiving that alliance as a
counterweight to excessive dependence on continental powers, especially Spain
(Teixeira, 2010). For a long time, that meant siding with Great Britain, with whom
Portugal could draw on an alliance said to date back to the 14th century. After World War
II, the focus shifted to the U.S., and the careful management of the Luso-American
relationship became a central concern of policymakers in Lisbon. During the Cold War
they were generally successful in that task: It is perhaps impossible to explain how
Portugal managed to hold on to vast colonial possessions in Africa until 1975 without
accounting for the political, financial, and at times military support extended by the U.S.,
mainly in return for access to Lajes Air Base, in Terceira Island (Gomes, 2025).
The end of the Cold War and the beginning of America’s unipolar moment (Krauthammer,
1990/1991) in 1989-1991 brought widespread uncertainty about the role that the U.S.
would play in the world. Portuguese decision-makers had reason to worry, as Lajes Base,
in the Azores, had been instrumental to American force projection and maritime
surveillance for decades (Mendes, 2018). In return for basing access, Portugal received
American economic and military assistance in non-trivial amounts (Cooley & Spruyt,
2009). Lajes was seen as the “cornerstone” of Luso-American bilateral ties (Lima, 2016,
p. 85), which were believed by many in Lisbon to amount to a “special relationship”
(Vasconcelos, 1990, p. 51). As Robinson (2016) put it, “Any potential removal of Lajes
from this relationship” would be “an existential crisis for Portugal’s role in NATO” (p.
137), a key pillar of its foreign policy.
As the Cold War ended and Soviet submarines disappeared from North Atlantic waters,
the Azores immediately lost much of its relevance to American and NATO maritime
surveillance (Cooley & Spruyt, 2009, p. 133). If a hegemonic U.S. could also dispense
with Lajes as an enabler of force projection, then there would be little to differentiate
Portugal from other European allies and – particularly worrying for Lisbon – from Spain,
its larger neighbour which was now also in the EU and NATO and hosted U.S. forces at
important military bases (Gillespie & Youngs, 2000). The situation was similar in many
ways to the danger of irrelevance that threatened Portugal in 1907, after Great Britain
and Spain signed the Pact of Cartagena (Teixeira, 2017, pp. 441-442, 469).
This time, however, decisionmakers in Lisbon had more options. In a unipolar world,
hedging was not a real possibility, since there were no great powers other than the U.S.
with which Lisbon could engage. But deepening European integration meant that the
European Union (EU), as it became in 1993, could perhaps provide Portugal with security,
prosperity, and diplomatic agency. Two main schools of thought came to dominate
foreign-policy debates in Lisbon: Atlanticists and Europeanists (Teixeira, 2017, p. 570).
Others saw the Lusophone world as a third strategic vector: By acting as a bridge
between these three regions, they believed, Portugal could not only maintain these three
strategic orientations simultaneously but even increase its profile in all three (Robinson,
2016, pp. 144-145). Regional crises often motivated American military intervention,
offering Lisbon opportunities to assert its status as a trusted ally by extending diplomatic
and, via Lajes Base, logistical support. Such was the case of the 1990-1991 Gulf War,
during which Lajes provided a platform for American tankers (Cruz, 2019, p. 217) and
cargo aircraft (Matthews & Holt, 1992, pp. 125-126).