The Panama Canal: the Waterway That Changed the World

Introduction: a Ribbon of Water Across the Americas

At its widest point, the Isthmus of Panama is only about eighty kilometers across — a thin thread of land connecting the North and South American continents and separating the Atlantic Ocean from the Pacific. For centuries, this narrow strip frustrated sailors, enriched merchants who could charge fees to transport goods across it, and haunted the imaginations of dreamers who wondered whether it might be possible to cut through it and link the two great oceans. When the dream was finally realized, on August 15, 1914, when the cargo ship SS Ancon made the first official transit of the Panama Canal, it did not merely create a new shipping route. It remade the economic geography of the globe, reshuffled the hierarchies of naval power, and stamped a permanent mark on the history of engineering, medicine, and geopolitical ambition.

The Panama Canal is, by almost any measure, one of the most consequential engineering projects in human history. The cutting of a navigable waterway through the mountains and jungles and swamps of central Panama required moving more than 250 million cubic yards of earth and rock — an amount that, stacked in a single column, would be visible from the moon. It required the labor of more than 75,000 workers over a decade of construction, thousands of whom died from tropical disease and industrial accidents. It required the invention of entirely new approaches to tropical medicine, the conquest of yellow fever and malaria in a region where those diseases had killed tens of thousands and helped doom an earlier French attempt to build the canal. It required the most expensive lock system ever constructed, raising and lowering ships eighty-seven feet above sea level through a series of massive chambers that remain, more than a century later, among the most impressive pieces of civil infrastructure ever built.

But the Panama Canal is not only an engineering story or a medical story. It is a political story: the story of how the United States, at the dawn of its rise to global superpower status, used its economic and military power to help create a new country — Panama, which gained independence from Colombia in 1903 in circumstances that continue to generate controversy among historians — specifically so that it could build and control a canal that would project American commercial and naval power across two oceans simultaneously. It is a story of imperialism and sovereignty, of the long struggle by Panamanians to reclaim control of the waterway that runs through the heart of their country, a struggle that culminated in 1999 when the United States finally handed full control of the canal to the Republic of Panama.

And today, in the early twenty-first century, the Panama Canal story continues in new chapters. The massive expansion of the canal, completed in 2016 after nine years of construction, added a third set of locks capable of handling the enormous container ships that modern global trade requires — ships nearly four times larger than the largest vessels the original canal could accommodate. The expanded canal transformed Panama's position in global commerce and set the stage for the next century of the waterway's extraordinary history.

This article tells the full story of the Panama Canal: the geography that made it possible and necessary, the long prelude of exploration and failed schemes, the French disaster, the American triumph, the human costs, the political struggles, the transfer of sovereignty, and the engineering marvel that continues to move goods and people between the world's two largest oceans every hour of every day.

The Geography of the Isthmus: Why Panama