Why did the turmoil of the French reveloutionary years result in a conservative European reaction

Fear of overthrow--European leaders were fearful they would be next in a liberal overthrow and banded together to protect the interests of their monarchies.

Klemens von Metternich of Austria convened the Congress of Vienna where he created a plan to protect the monarchies of Europe. Through alliances they all agreed to protect and defend each other if a revolution occurred in their country.