OpenStax
Open Stax: Great War 1914 1919: American Isolationism and European Origins of War
The foreign policy of Woodrow Wilson is explained, and how he tried to keep America neutral at the start of World War I yet intervened in international affairs in the Western Hemisphere. The reasons America declared war on Germany in...
Digital History
Digital History: War in Europe: Who Was Responsible? [Pdf]
This is a great overview of the events that immediately followed the assassination of Austria's Crown Prince Francis Ferdinand in Serbia in the lead-up to the start of World War I.
BBC
Bbc History: World Wars: World War One: The First Shot: 22 August 1914
Article about the first shot fired by British forces in World War I includes an eye-witness account of a young British cavalryman who was present at the engagement.
Other
Oswego State: The Great War Begins (1914)
Discusses the begining of World War I but from a Turkish perspective. Includes a section about a Turkish college at this time.