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Troop Formation at Kelly Field, Texas, taken in September 2017. Courtesy of the U.S. Air Force

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The U.S. entered World War 1. Large numbers of soldiers in small, unsanitary camps created the perfect breeding ground for a virus to spread.

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About 100 soldiers at Camp Funston in Fort Riley, Kansas became sick with a flu. By the next week, there were over 500 cases of the flu in the camp.

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The first known reports of influenza were published. The report told of three deaths from the flu in Kansas.

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British soldiers in a trench in France. Photo courtesy of the National WWI Museum and Memorial.

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Hundreds of soldiers continue to be sent overseas each month, spreading the flu across the world.

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Soldiers of the 304th infantry at Camp Devens. Photo courtesy of veteran-voices.com

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A second wave of the flu sweeps through Camp Devens, just outside Boston, Massachusetts. A quarter of the camp gets sick, and 757 deaths are reported.

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In this month alone, almost 200,000 Americans are killed by the virus. Many cities close schools, theaters, and other public spaces. Some begin to require masks to be worn in public.

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People gather to watch returning soldiers march to the capital building on Armistice Day. Photo Courtesy of the Austin Public Library

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World War 1 ends, and the celebrations that come in the following days lead to huge outbreaks of the flu. Salt Lake City, Utah begins placing signs that say "influenza" on the front and back doors of the homes of infected people.

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A third wave begins, and mask wearing, business closure, and widespread fear are all ramped up.

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David Lloyd George, Georges Clemenceau, and Woodrow Wilson on their way to negotiate the Treaty of Versailles. Photo courtesy of the Hulton Archives.

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President Woodrow Wilson contracts the flu while in Paris to negotiate a treaty. Although he survived, he passed out while at a peace conference a few days later, likely from lingering effects of the flu.

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The Flu Pandemic begins to die out. Although it never fully disappeared, fewer people were dying from the flu, so society largely began to move on.