Abolition of monarchy
The monarchy of Portugal was also overthrown in 1910 (5 October), two years after the assassination of King Carlos I, ending the reign of Manuel II, who died in exile in England (1932), without issue.
Abolition of monarchy
World War I led to perhaps the greatest spate of abolition of monarchies in history. The conditions inside Russia and the poor performance in the war gave rise to a revolution which toppled the entire institution of the monarchy, followed by a second revolution against that government in October of the same year that executed Emperor Nicholas II and implemented a Marxist-Leninist government. The defeated German, Austro-Hungarian and Ottoman empires saw the abolition of their monarchies in the close aftermath of the war, ending the reigns of Wilhelm II, Charles I and Mehmed VI respectively. The monarchs of the constituent states within the German Empire, most importantly Ludwig III of Bavaria, Frederick Augustus III of Saxony and Wilhelm II of Württemberg, soon abdicated. During the war, monarchies were planned for Poland (Kingdom of Poland), the Grand Duchy of Finland (to have a Finnish King), and for Lithuania (Mindaugas II of Lithuania), with a protectorate-like dependency of Germany. Both intended kings renounced their thrones after Germany's defeat in November 1918. King Nicholas I of Montenegro lost his throne when the country became a part of Yugoslavia in 1918.
After the death of the last Emperor, Bogd Khan, in 1924, Mongolia became a republic. In Spain the monarchy was again abolished in 1931 by the Second Spanish Republic (1931–1939). In 1947, General Franco declared Spain a realm, and appointed Juan Carlos of Bourbon his successor in 1969. The Prince of Spain became king at Franco's death in 1975, and constitutional monarchy was restored in 1978 under him.