Why is the capital of Turkey Ankara rather than Istanbul?

Question

Turkey's predecessor state, the Ottoman Empire, had its capital in Istanbul. Are there any reasons for the capital's move when it became Turkey?

Answer 1

Ankara became the capital of the new Turkish republic because after the collapse of the Ottoman Empire at the end of WWI the Allies occupied the old capital of Constantinople (later officially renamed Istanbul) and much of the surrounding territory on the Anatolian peninsula. While the Allies were deciding how to divide up the former Ottoman territory Mustafa Kemal Atatürk established the headquarters of his resistance movement in Angora (later officially renamed Ankara). By the time the Turkish nationalists led by Atatürk finished fighting their war of independence and solidified their borders in 1923, Angora was firmly established as their headquarters, so it made sense to make it the capital of the new Turkish republic for convenience and to symbolically differentiate themselves from the old Ottoman government.