Explanation

Prussia no longer exists, but former west and east Prussia are today part of Poland and Russia. They were given to Poland and Russia after the world war for various (good) reasons. Of these, four have (relatively) minor “pieces” of what was Prussia. These are Belgium (a small border area with modern Germany), Denmark (Aabenraa), Lithuania (Memel) and Russia (Kaliningrad, formerly known as Königsberg). The other two states are Germany and Poland.