In June 1914, a Serbian nationalist assassinated Archduke Franz Ferdinand, heir to the throne of the Austro-Hungarian empire, in Sarajevo, Bosnia. (Today, Sarajevo is the capital of Bosnia and Herzegovina.)

This deed set in motion a chain of events that plunged Europe into the most devastating war the world had ever seen. In the years before 1914, European nations had engaged in a scramble to obtain colonial possessions overseas and had constructed a shifting series of alliances seeking military domination within Europe. In the aftermath of the assassination, Austria-Hungary, the major power in eastern Europe, declared war on Serbia. Within a little more than a month, because of the European powers’ interlocking military alliances, Britain, France, Russia, and Japan (the Allies) found themselves at war with the Central Powers—Germany, Austria-Hungary, and the Ottoman empire, whose holdings included modern-day Turkey and much of the Middle East.

German forces quickly overran Belgium and part of northern France. The war then settled into a prolonged stalemate, with bloody, indecisive battles succeeding one another. New military technologies—submarines, airplanes, machine guns, tanks, and poison gas—produced unprecedented slaughter. In one five-month battle at Verdun, in 1916, 600,000 French and German soldiers perished—nearly as many combatants as in the entire American Civil War. By the time the war ended, an estimated 10 million soldiers, and uncounted millions of civilians, had perished. And the war was followed by widespread famine and a worldwide epidemic of influenza that killed an estimated 21 million people more.

Wilbur Wright, who with his brother Orville made the first powered flight in 1903, circling the Statue of Liberty six years later. World War I would reveal the military uses for this new technology.

The liner Lusitania, pictured on a “peace” postcard. Its sinking by a German submarine in 1915 strengthened the resolve of those who wished to see the United States enter the European war.

The Great War, or World War I as it came to be called, dealt a severe blow to the optimism and self-confidence of Western civilization. For decades, philosophers, reformers, and politicians had hailed the triumph of reason and human progress. Despite increasingly bitter rivalries between European powers, especially Germany and Britain, as they competed for political and military dominance at home and carved up Asia and Africa into rival empires, mankind seemed to have moved beyond the time when disputes were settled by war. The conflict was also a shock to European socialist and labor movements. Of the two great ideologies that had arisen in the nineteenth century, nationalism and socialism, the former proved more powerful. Karl Marx had called on the “workers of the world” to unite against their oppressors. Instead, they marched off to kill each other.


As war engulfed Europe, Americans found themselves sharply divided. British-Americans sided with their nation of origin, as did many other Americans who associated Great Britain with liberty and democracy and Germany with repressive government. On the other hand, German-Americans identified with Germany. Irish-Americans bitterly opposed any aid to the British, a sentiment reinforced in 1916 when authorities in London suppressed the Easter Rebellion, an uprising demanding Irish independence, and executed several of its leaders. Immigrants from the Russian empire, especially Jews, had no desire to see the United States aid the czar’s regime. Indeed, the presence of Russia, the world’s largest despotic state, as an ally of Britain and France made it difficult to see the war as a clear-cut battle between democracy and autocracy. Many feminists, pacifists, and social reformers, moreover, had become convinced that peace was essential to further efforts to enhance social justice at home. They lobbied vigorously against American involvement.

When war broke out in 1914, President Wilson proclaimed American neutrality. But as in the years preceding the War of 1812, naval warfare in Europe reverberated in the United States. Britain declared a naval blockade of Germany and began to stop American merchant vessels. Germany launched submarine warfare against ships entering and leaving British ports. In May 1915, a German submarine sank the British liner Lusitania (which was carrying a large cache of arms) off the coast of Ireland, causing the death of 1,198 passengers, including 124 Americans. Wilson composed a note of protest so strong that Bryan resigned as secretary of state, fearing that the president was laying the foundation for military intervention. Bryan had advocated warning Americans not to travel on the ships of belligerents, but Wilson felt this would represent a retreat from the principle of freedom of the seas.

The sinking of the Lusitania outraged American public opinion and strengthened the hand of those who believed that the United States must prepare for possible entry into the war. These included longtime advocates of a stronger military establishment, like Theodore Roosevelt, and businessmen with close economic ties to Britain, the country’s leading trading partner and the recipient of more than $2 billion in wartime loans from American banks. Wilson himself had strong pro-British sympathies and viewed Germany as “the natural foe of liberty.” By the end of 1915, he had embarked on a policy of “preparedness”—a crash program to expand the American army and navy.

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