Instructions: 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.
Input: Context: the Congress of Vienna awarded a great swathe of territory in this region to the Kingdom of Bavaria, Link Information: With Austria's defeat in the Austro-Prussian War, the northern German states quickly unified into the North German Confederation, with the Prussian king leading the state. Bavaria's previous inhibitions towards Prussia changed, along with those of many of the south German states, after French emperor Napoleon III began speaking of France's need for "compensation" from its loss in 1814 and included Bavarian-held Palatinate as part of its territorial claims. Ludwig II joined an alliance with Prussia in 1870 Answer: 53
Output:
How long did the Kingdom of Bavaria remain independent after the Congress of Vienna?