All the absolutistic rulers in Europe were frightened of a similar revolution in their countries. (In the absolute monarchies the kings decided on everything ignoring the Parliament.)
began in 1789 with the French Revolution
Europe. France is in Europe.
No European Nation supported the French Revolution.
king
a socialist party in most European countries
In violent opposition.
One of the changes in Europe that can be attributed to the french revolution is the existence of a socialist party in most European countries.
Other rulers may be concerned that the citizens of their nation, seeing the success of the French Revolution (and the American Revolution before it), could revolt against their government. The leaders wanted absolute power, and the ability of a nation to rise up against their government made rulers worrisome for their own countries.
french revolution
In part, because the large French economic crisis that created the French Revolution was added to by French aid to the Patriots.
no longer used monarchies
Some were afraid that Revolution would spread across Europe and beyond.