He was the Chairman of the Congress.
To discourage wars.
The leaders of the Congress of Vienna were trying to restore the balance of power in Europe in a peaceful manner.
Legitimacy. balance of power
Nationalism
The most important goal of congress of Vienna was to restore the balance of power, and that was why the punishment to France was not as severe. (B/c France needed to be one of the powers to maintain balance)
By ensuring that there was a Balance Of Power
Nationalism
The unification of Germany cause a shift in the balance of power created by the Congress of Vienna since most of the rights of sovereignty remained in the hands of the member governments.
The maintenance of a balance of power in Europe.
Nationalism
Leaders tried to keep a balance of power in Europe.