At the beginning of the 19th century the Ottoman Empire included all of the Balkan Peninsula north to the southern edge of the Hungarian Plain, but by 1914 had lost all of it except Constantinople and Eastern Thrace to the rise of Balkan nationalism, which saw the independence of Greece, Serbia, the Danubian Principalities and Bulgaria. Up until 1912 the Ottomans retained a band of territory including Albania, Macedonia and Thrace, which were lost in the two Balkan Wars of 191213.
When did the Ottomans lose the territory of Albania, Macedonia and Thrace?
the two Balkan Wars of 191213

Four years into the 20th century saw the Russo-Japanese War with the Battle of Port Arthur establishing the Empire of Japan as a world power. The Russians were in constant pursuit of a warm water port on the Pacific Ocean, for their navy as well as for maritime trade. The Manchurian Campaign of the Russian Empire was fought against the Japanese over Manchuria and Korea. The major theatres of operations were Southern Manchuria, specifically the area around the Liaodong Peninsula and Mukden, and the seas around Korea, Japan, and the Yellow Sea. The resulting campaigns, in which the fledgling Japanese military consistently attained victory over the Russian forces arrayed against them, were unexpected by world observers. These victories, as time transpired, would dramatically transform the distribution of power in East Asia, resulting in a reassessment of Japan's recent entry onto the world stage. The embarrassing string of defeats increased Russian popular dissatisfaction with the inefficient and corrupt Tsarist government.
What did the battle of Port Arthur establish?
the Empire of Japan as a world power.

Due to the inter-communal ethnic tensions between 1963 and 1974, an island-wide census was regarded as impossible. Nevertheless, the Greek Cypriots conducted one in 1973, without the Turkish Cypriot populace. According to this census, the Greek Cypriot population was 482,000. One year later, in 1974, the Cypriot government's Department of Statistics and Research estimated the total population of Cyprus at 641,000; of whom 506,000 (78.9%) were Greeks, and 118,000 (18.4%) Turkish. After the partition of the island in 1974, Greeks conducted four more censuses: in 1976, 1982, 1992 and 2001; these excluded the Turkish population which was resident in the northern part of the island.
What did the Cypriot government find was the Turkish population on Cyprus?
118,000 (18.4%)