Why did Franz Kafka write in German despite being born in Prague?

Franz Kafka was born in Prague, which was then part of the Austro-Hungarian Empire. He wrote in German because he was German in both language and culture.1

As a member of a German-speaking Jewish family in Prague, Kafka moved within German-Jewish intellectual circles throughout his life. While he lived in a city with a significant Czech population and expressed sympathy for Czech political and cultural aspirations, his primary identification remained with German culture. This linguistic and cultural background shaped his identity as a German-language writer, even though his position as a Jew in Prague left him feeling isolated from the broader German community and alienated from his own Jewish heritage.123