WORLD WAR I

The 20 sources are:
1. 1914 headline from The Sun, a New York newspaper
2. Photograph of German soldiers marching through the fields of Belgium during the 1914 invasion
3. 1914 photograph of a German U-boat submarine
4. 1915 illustration of the sinking of the RMS Lusitania by a German U-boat
5. 1915 photograph of the first armed Serbian aircraft
6. Photographs of land weapons of World War I, 1914–1919
7. Depictions of trench warfare, 1914–1918
8. Leaders of the Allied Powers after the United States entered the war in 1917
9. 1917 United States propaganda poster
10. British sugar ration card, 1917
11. 1917 Women’s Land Army poster displayed in Great Britain
12. From the diary of famous German pilot Manfred von Richthofen, 1917
13. 1917 United States recruitment posters for its branches of military service
14. Various hospital conditions during World War I, 1917
15. Leaders of the Central Powers of World War I, 1918
16. 1918 cartoon depicting YWCA hostess houses in 70 camps
17. 1918 poster titled “If I fail, he dies”
18. 1918 newspaper article reporting the surrender of German forces
19. 1919 poster titled “At Work Again”
20. Poems from World War I, 1914–1919