Wilson coined the phrase 'America First' and appealed for 'peace without victory.' But on April 2, 1917 he asked Congress for a declaration of war. The impact on American foreign policy was profound.

Mental health trauma has always been a part of war. Treatments have come a long way over the last century, but we still don't understand why the responses change for different people and times.

High school students in America learn two very different perspectives on World War I in their U.S. and world history classes. But which of these competing viewpoints should take center stage?

Before World War I, petroleum had few practical uses, but it emerged from the war as a strategic global asset necessary for national stability and security.

Many associate post-World War I culture with Hemingway and Fitzgerald's Lost Generation. But for black artists, writers and thinkers, the war changed the way they saw their past and their future.

During the war, fear of being undermined by the enemy sparked restrictions on freedom of speech. As a result, thousands of Americans were prosecuted.

A century ago, American women organized to protest World War I. The fact that their efforts failed isn't the most important point.

America's longstanding tradition of isolationism meant that in 1917 U.S. forces needed a lot of support from overseas allies to fight effectively.

Writings at the time of WWI aimed to construct a religiously diverse and conflicted America into a virtuous, Christian nation. This narrative continued in the cemeteries for the war heroes.