Woodrow Wilson initially believed the United States should not enter World War I, but by 1917 he had decided that the U.S. must enter the war against Germany.

Early view: stay neutral

At the start of the war in 1914, Wilson publicly argued that the United States should remain neutral in both “thought” and action.

He believed the conflict was a European war, and he wanted the U.S. to act as a peaceful mediator and “preserve the foundations on which peace may be rebuilt,” not as a combatant.

Why he wanted neutrality

  • He feared war would divide the American population, which included many recent immigrants from both Allied and Central Powers countries.
  • He saw the U.S. as having no direct territorial or imperial stake in the European struggle and wanted to avoid entangling alliances.
  • His political stance and 1916 campaign slogan “He kept us out of war” reflected a commitment to peace and nonintervention.

Shift toward intervention

By 1917, Wilson concluded neutrality was “no longer feasible” and that the U.S. should enter the war on the side of the Allies.

He presented this as a reluctant but necessary decision, not a sudden enthusiasm for war.

Why he changed his mind

  • Continued unrestricted German submarine warfare, including attacks on ships with American passengers and cargo, convinced him Germany was effectively waging war on the U.S. economy and people.
  • The Zimmermann Telegram, in which Germany encouraged Mexico to attack the U.S. in exchange for lost territory, made German intentions toward the U.S. look openly hostile.
  • Wilson came to believe that U.S. intervention was necessary to protect neutral rights and to help secure a just peace rather than a purely punitive settlement.

His stated justification

When Wilson asked Congress for a declaration of war in April 1917, he said that Germany was engaged in “nothing less than war against the government and people of the United States.”

He framed U.S. entry as a mission to make the world “safe for democracy,” insisting America sought no conquest or material gain but fought as a “champion of the rights of mankind.”

So what did Wilson think?

  • Before 1917: Wilson thought the U.S. should stay out of World War I and remain neutral while trying to promote peace.
  • By April 1917: He believed the U.S. had to enter the war because German actions made neutrality impossible and because he saw an opportunity—and a duty—to shape a democratic, stable postwar order.

In short: Wilson moves from “America should not enter this war” to “America must enter to defend its rights and help build a better peace.”

TL;DR:
Wilson first opposed U.S. entry into WWI, favoring strict neutrality and mediation, but after German submarine attacks and the Zimmermann Telegram, he decided the U.S. should enter the war to defend American rights and make the world “safe for democracy.”

Information gathered from public forums or data available on the internet and portrayed here.