Final answer:
Poland is the country that has Pomerania divided with Germany. It gained this territory after World War I through the Treaty of Versailles which created the Polish Corridor, and its borders were further solidified after World War II.
Step-by-step explanation:
The country that has Pomerania, a historic region on the Baltic Coast divided between it and Germany, is Poland. After World War I, Poland was reestablished as an independent nation through the Treaty of Versailles in 1919, which also created the Polish Corridor to give Poland access to the Baltic Sea.
This action led to part of Pomerania being under Polish authority. The Treaty of Brest-Litovsk did not grant territory to Germany; instead, it was a separate peace treaty between the Bolshevik government of Soviet Russia and the Central Powers.
However, territory gains and losses throughout history have often been influenced by various treaties and territorial adjustments after conflicts such as World War I and World War II.
Post World War II, the Potsdam Conference aimed to realign national borders along ethnic lines, which further solidified Poland's claim over parts of Pomerania. Today, Pomerania remains divided between Germany and Poland, with Poland holding a significant portion of the region.