Which war was ended with the Ottoman's defeat at the Battle of Zenta?
Transformation of the Ottoman Empire The Transformation of the Ottoman Empire, also known as the Era of Transformation, constitutes a period in the history of the Ottoman Empire from  1550 to  1700 , spanning roughly from the end of the reign of Suleiman the Magnificent to the Treaty of Karlowitz at the conclusion of the War of the Holy League. This period was characterized by numerous dramatic political, social, and economic changes, which resulted in the empire shifting from an expansionist, patrimonial state into a bureaucratic empire based on an ideology of upholding justice and acting as the protector of Sunni Islam. These changes were in large part prompted by a series of political and economic crises in the late sixteenth and early seventeenth centuries, resulting from inflation, warfare, and political factionalism. Yet despite these crises the empire remained strong both politically and economically, and continued to adapt to the challenges of a changing world. The seventeenth century was once characterized as a period of decline for the Ottomans, but since the 1980s historians of the Ottoman Empire have increasingly rejected that characterization, identifying it instead as a period of crisis, adaptation, and transformation.
Balkan League The Balkan League was an alliance formed by a series of bilateral treaties concluded in 1912 between the Balkan states of Greece, Bulgaria, Serbia and Montenegro, and directed against the Ottoman Empire, which at the time still controlled much of the Balkan peninsula. The Balkans had been in a state of turmoil since the early 1900s, with years of guerrilla warfare in Macedonia followed by the Young Turk Revolution and the protracted Bosnian Crisis. The outbreak of the Italo-Turkish War in 1911 had further weakened the Ottomans and emboldened the Balkan states. Under Russian influence, Serbia and Bulgaria settled their differences and signed an alliance, originally directed against Austria-Hungary on 13 March 1912, but by adding a secret chapter to it essentially redirected the alliance against the Ottoman Empire. Serbia then signed a mutual alliance with Montenegro, while Bulgaria did the same with Greece. The League was victorious in the First Balkan War which broke out in October 1912, where it successfully wrestled control of almost all European Ottoman territories. Following this victory however, unresolved prior differences between the allies re-emerged over the division of the spoils, particularly Macedonia, leading to the effective break-up of the League, and soon after, on 16 June 1913, Bulgaria attacked her erstwhile allies, beginning the Second Balkan War.