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How did Dutch, English, and French competition challenge Portuguese overseas power?

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Map showing the transatlantic and global routes of major early voyages of discovery and exploration by Spain, Portugal, England, and France during the 15th and 16th centuries. The map traces the journeys of explorers such as Columbus, Cabot, Magellan, da Gama, and others, with labeled paths crossing the Atlantic and encircling Africa and South America, as well as lines of demarcation dividing Spanish and Portuguese exploration zones. — European exploration Map depicting the European exploration of the New World in the 15th and 16th centuries, including the voyages made by Christopher Columbus, John Cabot, Alonso de Ojeda and Amerigo Vespucci, Pedro Álvares Cabral, Ferdinand Magellan and Juan Sebastián del Cano, Giovanni da Verrazzano, Jacques Cartier, Sir Francis Drake, and others. The lines of demarcation represent an early division between the territory of Spain (to the west) and Portugal (to the east).

For nearly a century, Portugal maintained a dominant, though territorially limited, seaborne empire based on strategic fortifications and trade posts. This hegemony was challenged and eventually eclipsed by Dutch, English, and French competition, driven by the desire to break Portuguese monopolies and secure lucrative trade in spices and enslaved labor.1234

The decline of Portuguese power was accelerated by several key factors:

Political Union with Spain: In 1580, the Portuguese throne was seized by Philip II of Spain. Consequently, Portugal’s overseas interests were sacrificed to Spanish geopolitical goals, making Portuguese territories targets for Spain’s European enemies, particularly the Dutch and English.41
Dutch Expansion: Following their revolt against Spanish rule, the Dutch organized their own oceanic ventures. The Dutch East India Company (VOC) and Dutch West India Company aggressively targeted Portuguese trade networks in the East Indies and western Africa, seizing key forts and establishing their own commercial monopolies.536
English and French Competition: Resentful of Dutch and Portuguese economic power, England and France chartered their own companies, supported by their respective royal navies, to challenge existing monopolies and secure their own colonial interests in the Americas and Africa.3

Ultimately, Portugal’s lack of sufficient manpower and warships, combined with the rise of these well-organized, state-backed competitors, ended its supremacy in the East.41