The name of the Ottoman Empire comes from the founder Osman. Osman is a Turk who has lived in the Amu Darya River basin for generations. In13rd century, Mongols invaded the west, and Turkey was forced to move and attach itself to the Sultanate of Rome. In A.D. 1299, the Sultanate of Rome was divided internally and the country fell into chaos. Under the leadership of Osman, the Turks declared their independence, which was the predecessor of the Ottoman Turkish Empire. Orhan I, the son of Osman, embarked on the road of military expansion. He first occupied most of the territory of the Sultanate of Rome, and later conquered western Thrace, Macedonia, Sofia, Thessaloniki, Greece, Serbia, Bulgaria, Hungary and other countries.

After several generations of continuous efforts, the Ottoman Empire spans three continents: Asia, Europe and Africa, and owns most of the territories in the Balkans, the Middle East and North Africa. West to the Strait of Gibraltar, east to the Caspian Sea and Persian Gulf, north to Austria and Slovenia, south to Sudan and Yemen, with a total area of 5.5 million square kilometers and a population of 23.8 million! However, because of excessive expansion, it also laid a hidden danger for the demise of the Ottoman Empire.

The main causes of Osman's death are as follows.

1, extremely inflated, and the contradictions among various ethnic groups in China are relatively large, leaving hidden dangers.

2. With the rise of western Europe and the arrival of the era of great navigation, everyone began to colonize Asia and gained countless wealth. Originally, everyone could reach Asia by land, but the Ottoman Empire blocked land transportation, so the western European powers began to hate the Ottoman Empire.

3. Western European countries bypassed Turkey's trade monopoly and established sea routes to Asia. The influx of silver from the New World led to the devaluation and inflation of Turkish currency, which had a serious negative impact on all sectors of Turkish society and increased domestic contradictions.

Ottoman and Russia fought an endless war for the Mediterranean, and finally Turkey was defeated.

However, it was World War I that overwhelmed the Ottoman Empire. In the First World War, the Ottoman Empire joined the Allies and established the Allies camp with Germany, Austria-Hungary and other countries, while the other side was Britain, France, Russia, Italy and the United States. Finally, the allies failed and the Ottoman Empire disintegrated.