The Decline of Portugal’s Seaborne Empire During …

Years: 1540 - 1683

The Decline of Portugal’s Seaborne Empire During the Iberian Union (1580–1640)

Portugal’s overseas empire had already begun to decline before the Iberian Union, but its 60-year incorporation under Spanish rule (1580–1640)—known in Portugal as the "Spanish Captivity"accelerated the process. Under Spanish rule, Portugal was dragged into Spain’s conflicts with England and the Dutch Republic, resulting in the loss of key territories in Asia, Africa, and Brazil.


Impact of the Iberian Union on Portugal’s Empire

  1. Wars with England and the Dutch Republic

    • As part of Spain’s empire, Portugal became an enemy of England and the Dutch, two rising naval powers.
    • The Dutch and English targeted Portuguese trade routes, attacking fortified cities and commercial outposts in the Far East, Africa, and the Americas.
  2. Dutch and English Conquests in Asia and India

    • The Dutch seized Portuguese-controlled trading posts in the East Indies, undermining Portugal’s monopoly on the spice trade.
    • The Dutch East India Company (VOC) captured:
      • Malacca (1641)—a major Portuguese hub in Southeast Asia.
      • Ceylon (Sri Lanka, 1638–1658)—cutting off Portugal’s access to cinnamon trade.
      • The Moluccas (Spice Islands)—ending Portugal’s dominance in the nutmeg and clove markets.
    • The English gained a foothold in India, gradually taking over Portuguese commercial influence.
  3. Attacks on Portuguese Brazil

    • The Dutch West India Company (WIC) attacked Brazil, seeking to dominate the lucrative sugar trade.
    • They:
      • Occupied Pernambuco (1630–1654), the richest sugar-producing region in the Americas.
      • Captured and raided Bahia and Rio de Janeiro.
    • Only resistance from Portuguese settlers and indigenous allies prevented a total Dutch conquest of Brazil.
  4. Portuguese Trade Monopolies Weakened

    • The Dutch and English broke Portugal’s commercial monopoly in both the Indian Ocean and the Atlantic.
    • Lisbon lost control over vital trade networks, leading to economic decline.

Conclusion: A Severely Weakened Empire by 1640

  • By the time Portugal regained independence in 1640, its empire was greatly reduced.
  • The Dutch controlled key territories in Asia, the English had established themselves in India, and Portugal’s monopoly on global trade had collapsed.
  • The only bright spot was that Portuguese settlers and militias managed to defend Brazilpreventing it from becoming a Dutch colony.

The Iberian Union (1580–1640) was a period of decline for Portugal, accelerating the loss of its global dominance and marking the beginning of its transition to a second-tier colonial power.

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