First World War
First World war.com: Primary Documents: The "Willy Nicky" Telegrams
The content of ten telegrams exchanged between the German Emperor, Wilhelm II, and the Russian Tsar, Nicholas II, just prior to the outbreak of World War I, in the period from July 29 to August 1, 1914.
Brigham Young University
Harold B. Lee Library: The World War I Document Archive
Explore this archive of primary source documents from World War I. Content includes maps, photographs, various peace treaties, diary notes, official papers and more.
Internet History Sourcebooks Project
Fordham University: Modern History Sourcebook: Private Donald Fraser
Contains a first-person primary source account of WWI that focuses on trench warfare and "No Man's Land."
Curated OER
History Matters: The Zimmerman Telegram Bringing America Closer to War
This is a copy of the actual Zimmerman Telegram where Germany states that it "Intends to begin - unrestricted submarine warfare." A great primary source that takes students deeper into historical understanding.
Wisconsin Historical Society
Wisconsin Historical Society: Selling the War to the American Public
A resource filled with primary source materials, posters that promoted support for World War I. Included is a worksheet that can be used to analyze any of the resources, all of which are PDF files.