Because they are Turkish. Aren't they?
If the question is asking historically how Turkish came to Anatolia, the answer is that when the Seljuks and Ottomans conquered the eastern areas of Anatolia, there was a process of Turkification where native Anatolians intermarried with invading Turks, began to speak their language and converted to Islam. This process occurred over centuries and led to the extinction of non-Turkish languages (other than Arabic and Kurdish) among the Muslim population of Anatolia. The Christians and Jews (who preserved their languages in spite of Turkification) were forced out of Anatolia during the tumultous period between 1914-1924. Some, like the Greek Orthodox left in violent population exchanges. Some, like the Jews just fled. Some like the Armenians were massacred and genocided. Regardless, when these non-Muslim Turks were forced out of Turkey, only the Turkish and Kurdish languages remained.
When Mustafa Kemal founded Turkey, he made Turkish the mandatory national language of the country in the same way that Greek became the language of Greece and German is the language of Germany.
Turkish people speak Turkish. It is the official language of Turkey and is also spoken in parts of Cyprus and other countries with Turkish communities.
Turkish people speak Turkish, which is a Turkic language. It is the official language of Turkey and is spoken by the majority of the population.
Some Turkish people can speak English, mostly the ones that live in America. But some Turkish people can also speak Kurdish, another type of language spoken in Turkey.
160 million people in the world speak the Turkish and the turkic language(former Turkish colonies).
Islam
It is estimated that around 3 million Turkish people speak German. German is the second most spoken language among the Turkish population in Germany.
No. People from Turkey mainly speak Turkish.
They are both because Greek Cypriots sometimes speak Turkish and Turkish Cypriots sometimes speak Greek. But Turkish Cypriots always have a different accent to people from Turkey because they don't like to think of themselves as Turkish people, they think of themselves as Cypriot's. Greek Cypriots are the same.
Some Turkish people may speak French, especially if they have learned it as a second language or have lived in a francophone country. However, French is not widely spoken in Turkey as the primary language.
Yes. A significant minority of Turkish citizens (15-17 million people) speak Kurdish.
I know 53 Turkish who speaks English. (Including me)
People in Kurdistan primarily speak Kurdish, which is an Iranian language. Additionally, minority groups in the region may also speak Arabic, Turkish, or other languages.