events
World War II: The United States declares war on Bulgaria, Hungary, and Romania.
Related Wikipedia articles
Kingdom of Bulgaria
State in southeastern Europe from 1908 to 1946
The Tsardom of Bulgaria, also known as the Third Bulgarian Tsardom, usually known in English as the Kingdom of Bulgaria, or simply Bulgaria, was a constitutional monarchy in Southeastern Europe, which was established on 5 October [O.S. 22 September] 1908, when the Bulgarian…Source: Wikipedia (CC BY-SA)
Kingdom of Hungary
Central European monarchy (1000–1946)
The Kingdom of Hungary was a monarchy in Central Europe that existed for nearly a millennium, from 1000 to 1946 and was a key part of the Habsburg monarchy from 1526-1918. The Catholic kingdom emerged as a continuation of the Grand Principality of Hungary upon the coronation of…Source: Wikipedia (CC BY-SA)
Kingdom of Romania
Kingdom in Europe between 1881 and 1947
The Kingdom of Romania was a constitutional monarchy that existed from 25 March [O.S. 13 March] 1881 with the crowning of prince Karl of Hohenzollern-Sigmaringen as King Carol I, until 1947 with the abdication of King Michael I and the Romanian parliament's proclamation of the…Source: Wikipedia (CC BY-SA)