How did the Crimean War mark the end of a period of peace and balance in Europe?

On 30th March 1856, the Crimean War was formally brought to an end with the signing of the Treaty of Paris. This formal recognition signed at the Congress of Paris came after Russia accepted a humiliating defeat against the alliance of Britain, France, the Ottoman Empire and Sardinia

nation:

most of the knowledge we have of the conflict comes from roman-jewish scholar titus flavius josephus, who first fought in the revolt against the romans, but was then kept by future emperor vespasian as a slave and interpreter.

the answer is states.