- Air ships in the first World War
- America Enters War: April, 1917
- America Enters War: Congresswoman Jeannette Rankin opposed
- America Joins the War: In April of 1917, after the war had dragged on nearly three years, the United States declared war on Germany
- American Attitudes Toward Germany: Events push the U.S. toward conflict
- American Soldiers: Two million sent
- Americans War-Weary: July 1919 report - "They are tired of the war and everything belonging to it. They are almost hysterically anxious to get back to peace conditions, and they cannot quite understand why the process takes such a long time."
- Assassination of Archduke Ferdinand: Precipitating cause of World War I
- Belgian Neutrality, Violated: Invasion of Belgium based on "news" not "knowledge" - (see Kaiser Wilhelm II's original Communiqué)
- British Life in WWI: A time of deprivation
- Censorship in America: Prior restraint, and other free-speech restrictions, in U.S. during WWI
- Chemical Weapons, First Used: Germany first to use chemical weapons in the second battle of Ypres
- Document Archive, WWI: Explore many primary sources - (third paragraph, click on "World War I")
- "Dominoes Falling" Theory: A reason for the widespread scope of war
- Espionage/Sedition Acts: Significant restrictions on free speech in America
- Food Shortages: People endured food shortages throughout WWI
- Germany: Superior air power, start of war
- Horrors of the Trenches: Impossible to imagine - (for numerous video clips, click on "horrors" in the second paragraph)
- Italy - Fought with Allied Side: Italy opposed Germany in WWI
- Life in the Trenches: Soldiers endured unbelievable hardships - (click on links in last three paragraphs for animations, pictures and videos)
- Lusitania: Sinking draws America into WWI
- Mothers, Impacted By War: Art created by war moms, like Kathe Kollwitz - (see chapter 10)
- Posters, Conserve Food: U.S. posters urging Americans to conserve food
- Posters, Emotional Appeals: Government-created emotional appeals to children
- Prohibition, Alcohol: Law proposed by Congress during WWI
- Recruitment, Poster: Famous 1918 Uncle Sam, "I Want YOU" - (see fourth paragraph)
- Russian People, Starving: Condition of Russian people during war and lack of attention by Nicholas II
- Somme, Battle of: Extremely difficult conditions for soldiers - (click on "churned out corpses," in the second quote, for video clip)
- Spanish Flu: A pandemic of flu killed more people during the war than the war itself
- Spanish Flu, Second Wave: Returning soldiers spread now-mutated virus
- Treaty of Versailles: While the treaty ended WWI, many scholars think it contributed to the start of WWII
- Trenches, Soldiers Digging: Soldiers on the western front had to dig trenches before they "lived" in them - (see fourth paragraph, "the trenches," for animation)
- Western Front: Men lived, and died, in French trenches
- "Willy-Nicky" Telegrams: Correspondence between Kaiser and Tsar just before war - (second paragraph, click on "governed by cousins")
- Woodrow Wilson, Massive Stroke: U.S. president had incapacitating stroke (1919) - American people were not told - (see second-to-last paragraph)
- "Worst Epidemic," U.S. History: Spanish Flu during WWI - (see pictures from national archives)