events
World War I: The United States declares war on Austria-Hungary.
Related Wikipedia articles
World War I
1914–1918 global conflict
World War I or the First World War, also known as the Great War, was a global conflict between two coalitions: the Allies and the Central Powers. Main areas of conflict included Europe and the Middle East, as well as parts of Africa and the Asia-Pacific. There were important…Source: Wikipedia (CC BY-SA)
Austria-Hungary
1867–1918 empire in Central Europe
Austria-Hungary, also referred to as the Austro-Hungarian Empire, the Dual Monarchy or the Habsburg Monarchy, was a multi-national constitutional monarchy in Central Europe between 1867 and 1918. A military and diplomatic alliance, it consisted of two sovereign states with a…Source: Wikipedia (CC BY-SA)