Ellis Island: A Man-Made Landmark Born from Glaciers, Oysters, and Jurisdictional Battles

Cultures · Published 29 September 2026 Swipe more like this →

In short: Long before it became the gateway for 12 million immigrants, Ellis Island was a shifting, marshy trio of oyster-rich islands. Expanded through massive land reclamation and caught in a centuries-long legal tug-of-war between New Jersey and New York, this tiny harbor outpost holds a complex, often overlooked history.

Formed by retreating glaciers 15,000 years ago, the island was once a tidal hummock known to the Mohegan as Kioshk, or Gull Island. By the colonial era, it was part of the Oyster Islands, a name reflecting the vast beds that sustained local Native American tribes. After passing through various private hands—including those of Samuel Ellis, who purchased it in 1774—the federal government acquired the site in 1808 for $10,000 to bolster harbor defenses. It served as a military fort and naval magazine for decades before the government pivoted to immigration processing in the 1890s.

The island’s physical footprint was radically altered between the late 1890s and 1930s. Through extensive land reclamation, the original landmass was expanded and joined with two additional artificial islands to accommodate the growing immigration station. This expansion obliterated the oyster beds and created the current 27.5-acre, C-shaped island. The construction of the second, fireproof station—designed by Edward Lippincott Tilton and William A. Boring—opened in 1900, processing thousands of arrivals daily. However, the facility was frequently overwhelmed, necessitating constant expansions and the addition of hospital wards and barracks.

The island’s most peculiar legacy is its legal status. Because the land reclamation occurred in waters historically claimed by New Jersey, a jurisdictional dispute simmered for over a century. The conflict reached the U.S. Supreme Court in 1998, which ruled that while the federal government owns the island, the 4.68-acre natural portion remains an exclave of New York, while the 22.80 acres of reclaimed land belong to New Jersey. Today, the site functions as a national museum, standing as a testament to both the millions who passed through its gates and the strange, artificial geography of New York Harbor.

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