Eastern region of Europe was known as the Balkans. Many states were located in this area, such as Greece, Romania, Bulgaria, Serbia, Montenegro and many other small states were under the control of the Ottoman Empire. Ottoman began to lose power in the early 20th Century. The Slavic living in Austria and Serbia launched a national movement in support of Russia which is called the All Slavic movement, whose aim was to liberate the state of Serbia, the Slavic region. Austria protested this movement. In 1908 Austria and Serbia became the adversaries of one another and this became the cause of World War-I.
