Read the text and choose the appropriate answer.
Amir Temur was born on April 9, 1336 in the village of Hojailgor near Shahrisyabs. His father was a rich man whose name was Amir Taragay. His mother Teguna was a noble woman. Amir Temur was well educated in his family. He was strong and handsome. At his early age he was interested in State Affairs and military activities. He spent much time on military training and getting an education. His knowledge in geography, medicine, history and astronomy often astonished scientists.
In his youth he took part in the wars between various landowners and in one of the battles his hand and leg were wounded. His hand recovered but his leg remained lame. Still he took an active part in the fight of the Central Asian people for their freedom. He put an end to the battles between Khans and Beks and established a powerful centralized state. He became a famous statesman and great leader of the Uzbek people. He was well-known all over the world as Great Temurlane.
 
What made it possible for Amir Temur to establish a centralized state?