When did the Congress of Vienna take place?

The Congress of Vienna took place between 1814 and 1815, making this the correct choice. This gathering was convened in the aftermath of the Napoleonic Wars with the aim of restoring stability and order to Europe. Key figures, including diplomats and statesmen from various European powers, came together to negotiate a new balance of power that would help prevent further widespread conflict.

The Congress is notable for its decisions that reshaped national boundaries, established new political frameworks, and aimed to promote peace in Europe through collective security and diplomacy. This period was crucial in laying the groundwork for international relations and diplomacy in the 19th century.

In contrast, the other time frames listed do not correspond to the Congress of Vienna. The years from 1810-1812 occurred during the height of the Napoleonic Wars, while the years 1820-1821 and 1830-1831 involved other significant events in Europe, such as revolutions and uprisings, rather than the diplomatic negotiations of the Congress.