what civilisation did turkey come from ?

There's a confusion as i can see from the answers.

If you mean Anatolia,it's another subject. But as for Turkish civilization,you can track the nation thousands of years ago into middle asia where they established most of their empires. After that Turkish tribes scattered all around Asia and Europe forming hundreds of different countries and ending at todays Turkey lands with Seljuk and Ottoman empires.

The modern nation-state of Turkey was created after World War I, out of the Ottoman Empire, which ruled the region (including huge parts of Africa, Eastern Europe and the Middle East) since the end of the 13th century.

Immediately before the Ottomans it was the Byzantine empire, and before that, Roman. Each of those lasted many centuries... The Byzantines were 330-1453 CE. If you go back to 550 BCE–330 BCE, all of what is not Turkey was in the Achaemenid Empire, which basically developed into Persian/Iranian civilization, which continued to have some control in the east. Modern Turkish has a lot of Persian words, and that's even more true of the ethnic languages in the eastern part of the country today. There were Armenian conquests as well. The Sumerians, and if you go way, way back, (before 2000 BCE) the Akkadian empire, were based in what is now Iraq, but they definitely conquered areas of what is now Turkey and left significant artifacts there.

So the short answer is Ottoman civilization, the more complicated long-term answer is a series of empires coming in from both the east and the west.

Actually the Turks were originally a warrior tribe/tribes the Saracen and Seljuk and were more nomadic. Got caught up in the Crusades as a Holy War after the Muslims lost Jerusalem and they were the ones who basically fought from then own. The took Constantinople from the Eastern Roman Empire and finished it off after the Crusaders sacked it and left it defenseless and found the Ottoman Empire which was one of the longest lived Empires, about 700 years, in history and did not fall until 1918 when it was broken up for siding with the German and Austrian-Hungarians in that war. Once controlled all of the middle east, North Africa, Spain and part of Russia and eastern Europe.

They are an ethnic group called the Turks. There is also Turkestan, but Turkey--pronounced Turk ay was the Ottoman Turks. The Ottoman Dynasty (or the Imperial House of Osman) ruled the Ottoman Empire from 1281 to 1923. At that time they became a republic. Note the date of the dynasty is from Wikipedia.

The Ottoman Turks -- the origin of modern Turkey -- did not come out of the Fertile Crescent (though they eventually conquered it). They were one of the powerful but illiterate Central Asian tribes of whom the Romans knew nothing, and thus were poorly documented.