The Preparedness Movement was a massive, highly influential political and cultural campaign between 1914 and 1917 that aggressively built up the United States Military. It emerged immediately after the outbreak of World War I in Europe and served as a fierce counterweight to President Woodrow Wilson’s official policy of neutral isolationism.
The movement's core philosophy was simple: the United States was dangerously unprepared for a modern global conflict, and the only way to guarantee peace and security was through overwhelming strength.
Former President Theodore Roosevelt, the face of the Preparedness Movement, used his immense public platform to attack Wilson’s “unarmed neutrality” as cowardly and dangerous. Alongside him was General Leonard Wood, the former Army Chief of Staff. Together, they argued that an unprepared nation would suffer the same brutal fate as occupied Belgium.
Meanwhile, lobbying groups like the National Security League and the Navy League were formed to back their efforts, organizing massive “Preparedness Parades” in major cities that drew hundreds of thousands of marching citizens.
Because the regular U.S. Army was minuscule at the time—ranking far behind European powers with fewer than 130,000 men—the military desperately lacked trained officers. To fix this, General Wood launched an experimental summer program at the Plattsburg Barracks in upstate New York. This became known as the Plattsburg Movement, in which elite business professionals, lawyers, and Ivy League graduates (including Theodore Roosevelt Jr.) paid out of pocket to spend their summer vacations sleeping in tents, drilling, and learning military tactics. The concept eventually trained roughly 40,000 men nationwide, providing the backbone of the U.S. Military's officer corps when America finally entered the war in 1917.
Preparedness advocates did not want a massive, permanent standing military aristocracy, which they viewed as un-American. Instead, they championed Universal Military Training (UMT). They believed that every young man turning 18 should undergo several months of compulsory military training. Proponents argued this would serve a dual purpose: provide an instant, democratic citizen-reserve army in times of crisis, and instill discipline, patriotism, and civic virtue across social classes.
Initially, the movement faced intense opposition from pacifists, labor unions, and rural Democrats who feared it was engineered by wealthy industrialists to drag America into war. However, after a German U-boat sank the passenger liner RMS Lusitania in 1915, public opinion swung sharply. President Wilson was forced to compromise, culminating in the National Defense Act of 1916, which dramatically expanded the Regular Army and the National Guard.
When the war ended, the men who had been molded by the Preparedness Movement—and who subsequently fought in Europe—realized their early warnings had been entirely correct. The U.S. had entered WWI chaotic, poorly equipped, and dependent on European allies for basic weaponry like tanks and planes. When these men returned home to found The American Legion in 1919, they transplanted the exact blueprints of the pre-war Preparedness Movement—specifically the Plattsburg Idea of the citizen-soldier and the crusade for Universal Military Training—directly into the Legion’s foundational National Security pillar. It was out of this that the Legion formed the Aviation Committee as one of its first committees.