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Prussia was a great beneficiary. It had been a rising power for most of the 18th century, but its progress was set back by the Napoleonic wars, regime. Prussia was a "conservative" state that benefited for Metternich's reactionary tendencies, but the most dynamic of conservative states that also included Russia, Austria-Hungary and the Ottoman empire. As such, it was an acceptable core for the newly emerging German power.
The Metternich system seemed to benefit conservative Russia, but that country soon lost in dynamism what she gained in political stability. France was something of a loser; from a fundamentally offensive posture since the 15th century, she went more and more on the defensive as the 19th century wore on. Britain gained from the balance of power and the hobbling of the more conservative states