Final answer:
The decline of the Ottoman Empire can be attributed to internal corruption, weak leadership, and lack of technological development, as well as nationalistic movements and the expansionist aims of European powers.
Step-by-step explanation:
The decline of the Ottoman Empire and the rise of geopolitics can be attributed to several factors. Firstly, the Ottoman Empire experienced internal corruption, weak leadership, and lack of technological development, which led to its gradual weakening throughout the 19th century. Additionally, the rise of nationalistic movements among ethnic groups within the empire, such as Greeks, Serbs, and Bulgarians, contributed to the disintegration of Ottoman territories and their quest for independence. Lastly, European powers, especially Russia, took advantage of the declining Ottoman Empire and sought to expand their influence, leading to geopolitical changes in the region.