The History of America's Territorial Acquisitions

From the Louisiana Purchase to the Virgin Islands, the US has expanded its reach through strategic land deals.

Published on Feb. 18, 2026

The debate over the potential purchase of Greenland by the United States has revived questions about America's history of territorial acquisitions through large-scale land deals. From the Louisiana Purchase to the acquisition of Florida and the Virgin Islands, the US has repeatedly expanded its reach by writing checks backed by leverage when the balance of power left the seller with limited options. These transactions, while sometimes controversial, have played a major role in shaping the country we know today.

Why it matters

The Greenland debate resonates strongly because it touches on a long-standing pattern in American history of expanding the country's strategic footprint through territorial purchases. Understanding this history provides important context for evaluating the motivations and implications behind such proposals.

The details

The Louisiana Purchase in 1803 saw the US double its territory overnight by acquiring a vast expanse from France for $15 million. Similarly, the US compensated Spain $5 million to acquire Florida in 1819 after American settlers had already occupied much of the territory. In 1917, the US paid Denmark $25 million in gold to purchase the Virgin Islands, fearing they could fall under German control during World War I. These transactions, while sometimes controversial, allowed the US to strategically expand its reach.

  • The Louisiana Purchase was concluded in 1803.
  • The US acquired Florida from Spain in 1819.
  • The US purchased the Virgin Islands from Denmark in 1917.

The players

Thomas Jefferson

The US President who initiated negotiations with France for the Louisiana Purchase.

Robert Livingston

A Founding Father and US ambassador to France who declared the Louisiana Purchase "the noblest work of our whole lives."

Woodrow Wilson

The US President who sent a clear warning to Denmark that the US would occupy the Virgin Islands if they did not sell them.

Denmark

The country that sold the Virgin Islands to the US in 1917 for $25 million in gold.

France

The country that sold the Louisiana territory to the US in 1803 for $15 million.

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What they’re saying

“We have lived long, but this is the noblest work of our whole lives... From this day the United States take their place among the powers of the first rank.”

— Robert Livingston, US Ambassador to France

The takeaway

The history of America's territorial acquisitions through strategic land deals provides important context for understanding the motivations and implications behind proposals like the potential purchase of Greenland. While controversial, these transactions have played a major role in shaping the country we know today.