The primary objective of the Congress of Vienna in 1815 was to:
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A
Establish a long-term peace plan for Europe by creating a balance of power among the major states and restoring monarchical rule.
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B
Promote the principles of nationalism and self-determination for ethnic groups throughout Europe.
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C
Create the League of Nations to prevent future global conflicts through collective security.
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D
Unify the German states under Prussian leadership to create a strong central European power.