Immanuel Kant is always referred to as a German philosopher but he was born in and lived his whole life in Konigsberg Prussia so why is he considered German?

There is no doubt about the great philosopher Immanuel Kant having been born in Prussia. Kant is referred to as a German philosopher. The Teutonic Knights conquered the territory known as Prussia in the 13th century C.E.) and it was slowly Germanized over the centuries and became an integral part of medieval Germany by 1446, though it was not until 1701 that a Kingdom of Prussia was established. The Hohenzollern German Empire was formed in 1871 by the Chancellor Otto Von Bismarck, of which Prussia was the dominant part. After WWII, when the map of Europe was redrawn, more than half of Prussia became a part of Poland and half of East Prussia (including Königsberg, now Kaliningrad). The only areas of historic Prussia which are a part of present-day Germany are northern Germany (north of the Saar and Thüringen) and entire former communist state of East Germany. Due to the aforementioned reasons, Kant is referred to as a German philosopher, as the city Königsberg, where he was born, is a Germanic city (and was the capital of Prussia), though now under Russian suzerainty. When Kant was alive Prussia was one the German states.