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A disease named Influenza starts spreading rapidly to soldiers fighting during the war.

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It was mostly in urban and rural areas, infecting the U.S., India, Europe, and Asia. It went worldwide.

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In 1918 It became a pandemic, a disease prevalent over a large area or the entire world killing 20 million in Europe and the U.S. mostly affecting people younger than 5 years old, 20-40 years old, and 65 years and older.

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Soldiers returned home as the war ended came in contact with loved ones and started the spreading of the flu. Another cause was the nature of transportation at the time, and the amount of transport happening between the U.S. and Europe because of World War I, the virus quickly spread globally.

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20 million people died, and it affected everyone worldwide. From Europe to the U.S., India, etc. It also brought up concerns about nationalism and how although it was a powerful force, improvements in transportation were creating a global culture that would create global challenges.

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A good connection to this influenza pandemic is the Covid-19 virus in 2020 which caused a worldwide pandemic that resulted in people going into lockdown and self-quarantining. It resulted in the deaths of 6.8 million. Since people were so unprepared during the influenza pandemic, the fatalities were higher. We learned that by using masks it prevented the spreading of it even further.