It is true that The Congress of Vienna was able to prevent a war on the scale of the Napoleonic Wars for almost a century.
The 18th century and the early 19th century saw a lot of European wars which devastated the continent and culminated with the Napoleonic Wars which led to war on a continental level.
When the British and the Prussians finally defeated Napoleon, the Congress of Vienna was called to ensure that peace would reign in Europe.
The agreements in the Congress ensured that Europe did not fight on a continental level until the First World War a hundred years later.
More information on the Congress can be found in https://brainly.com/question/20599187.
