Final answer:
The Ottoman Empire declined due to economic troubles, military defeats, political instability, social unrest, and foreign interventions, culminating in its collapse post World War I.
Step-by-step explanation:
The decline of the Ottoman Empire was influenced by a multitude of factors that spanned economic, military, political, and social spheres. Economic decline played a significant role, as the empire suffered financially due to the direct redirection of international trade routes away from the Mediterranean, and the influx of cheap industrial goods from Western Europe.
Military defeats, such as the loss at the Battle of Lepanto and consistent setbacks against European powers like Russia, showcased the empire's weakening military prowess. Political instability, governmental decentralization, and corruption undermined the internal administration and effectiveness of the state. Social unrest and nationalism within the empire led to revolts and the gradual independence of various ethnic groups.