Final answer:
The agreement that originated from the Congress of Vienna was the Concert of Europe, which aimed to maintain stability in Europe post-Napoleonic Wars.
Explanation:
The agreement that came out of the Congress of Vienna was the Concert of Europe. This was the first international security organization established by Austria, Prussia, Russia, and Britain to maintain stability in Europe after the defeat of Napoleon in 1815. The countries in the Concert of Europe agreed to help each other in wars, suppress internal unrest, and met regularly to settle disputes, resulting in relative peace among major European powers for 99 years.
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