North Vietnam Seizes Trường Sa Islands in 1975

The North Vietnamese Army completed its capture of South Vietnamese-held islands in the Spratly chain in late April 1975, seizing the last outposts as part of the broader military campaign that reunified Vietnam. The Spratly Islands, a scattered archipelago of over one hundred small islands, reefs, and atolls in the South China Sea, had been partially occupied by South Vietnamese forces since the mid-1950s. The islands sit atop potentially vast reserves of oil and natural gas and straddle some of the busiest shipping lanes in the world, making them strategically valuable far beyond their negligible land area. South Vietnamese garrisons had maintained a presence on several islands, but as the North Vietnamese offensive swept across the mainland, the isolated island detachments were cut off from resupply and reinforcement. The captures were accomplished with minimal resistance, as most garrisons surrendered or evacuated rather than fight in defense of positions they could not hold. The seizure of these islands gave the unified Socialist Republic of Vietnam territorial claims in the Spratly chain that it has maintained and expanded ever since. The Spratly Islands remain one of the most contested territorial disputes in Asia, with competing claims from Vietnam, China, the Philippines, Malaysia, Taiwan, and Brunei. China has built artificial islands with military installations on several reefs, transforming submerged features into permanent bases with airstrips, radar installations, and missile batteries. The original Vietnamese, Philippine, and Malaysian occupations have been overshadowed by China's construction campaign, but the legal and strategic disputes show no sign of resolution.