Final answer:
The Congress of Vienna included Austria, Prussia, Russia, the United Kingdom, and later France as the key contributors in redrawing Europe's borders post-Napoleonic Wars, creating the Concert of Europe.
Step-by-step explanation:
The Congress of Vienna in 1814-1815, after the end of the Napoleonic Wars, was a significant event in European history that redrew national boundaries with the aim of restoring stability and establishing a new balance of power in Europe. The main powers involved in this decision-making process were part of the Concert of Europe, which included Austria, Prussia, Russia, and the United Kingdom, with France joining them by the end. These alliances were instrumental in maintaining peace in Europe and redrawing the continent's political landscape, balancing power, and preventing large-scale conflicts.