The diplomats at Vienna wanted to return Europe t the way it was before the French Revolution.
They opposed it.
No they didn't
They opposed slavery. Might wanna catch up on that homework.
rise of nationalistic movements
The French Revolution was the beginning of the end for the feudal era; other European nations gradually became less dominated by aristocracy, and more democratic. Not that it was a smooth process; it took WW I to bring an end to the German and Austro-Hungarian monarchies.
The diplomats at Vienna wanted to return Europe t the way it was before the French Revolution.
no longer used monarchies
yes
The British opposed the French Revolution and were supportive of the restoration of Monarchy.
They opposed it.
During the French Revolution, Spain, Portugal and France achieved their independence from the European monarchies that held power over them.
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.)
It was the French citizen who was opposed by the Royalty and the Catholic Church.
No they didn't
It became an immediate cause for war.
Of course. However, some scholars suggest that the French Revolution would have happened regardless, but most revolutions against monarchies during the 18th and 19th century have some roots in the American Revolution.
The Tennis Court Oath was important to the French Revolution as it signified the first time that French citizens were opposed to the King, Louis XVI's orders.