Q: In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.
Context: The modern Albanian-Serbian conflict has its roots in the expulsion of the Albanians in 1877-1878 from areas that became incorporated into the Principality of Serbia Link Information: Serbia was further expanded to the southeast in 1878, when its independence from the Ottoman Empire won full international recognition at the Treaty of Berlin. The Principality would last until 1882 when it was raised to the level of the Kingdom of Serbia.

Answer: Serbia
A:
What modern day country is the Principality of Serbia?