Decline and modernization of the Ottoman Empire
Beginning from the late eighteenth century, the Ottoman Empire faced challenges defending itself against foreign invasion and occupation. In response to foreign threats, the empire initiated a period of tremendous internal reform which came to be known as the Tanzimat, which succeeded in significantly strengthening the Ottoman central state, despite the empire's precarious international position. Over the course of the nineteenth century, the Ottoman state became increasingly powerful and rationalized, exercising a greater degree of influence over its population than in any previous era. The process of reform and modernization in the empire began with the declaration of the Nizam-ı Cedid (New Order) during the reign of Sultan Selim III and was punctuated by several reform decrees, such as the Hatt-ı Şerif of Gülhane in 1839 and the Hatt-ı Hümayun in 1856. At the end of this period, marked with 1908, to a degree the Ottoman military became modernized and professionalized according to the model of Western European Armies. The period was followed by the defeat and dissolution of the Ottoman Empire (1908–1922).
Postage stamps and postal history of Turkey
The Ottoman Empire signed the secret Ottoman-German Alliance on August 2, 1914, and entered hostilities on the side of the Central Powers in October 1914. The war and its disruptions are reflected in Ottoman's stamps issued during the war, which included stamps depicting soldiers and battle scenes, a number of provisional stamp issues in which available stocks of older issues were overprinted due to paper shortages, and stamps issued to collect a tax for war orphans. Remainders of stamps as old as 1865 were overprinted, some of which already had overprints, and sometimes multiple new overprints were added, resulting in a complex variety of configurations of interest to philatelists. The Allied Forces were victorious and occupied Constantinople, after which the Ottoman government collapsed. The Treaty of Sèvres, August 10, 1920 confirmed the dismemberment of the Ottoman Empire.