The German Confederation was one of the central results of the Congress of Vienna of 1814/15. On 8 June 1815, the assembled powers sanctioned the basis of the German Confederation in international law with the German Federal Act; according to the Vienna Final Act, it was an "association under international law" (Art. I) and, as a subject of international law, possessed the right to wage war and conclude peace. This was formally a constitutional treaty of the participating member states. By inserting the Federal Act into the Vienna Congress Act, its foundation was guaranteed by the great European powers. This was at least the view of the foreign great powers, who thereby reserved for themselves the right to object to constitutional amendments. The German states, on the other hand, strictly rejected this claim. Nor was it explicitly formulated in the acts.
Since the Federal Act was only a framework agreement, it had to be supplemented and specified. It was not until five years later that the representatives of the federal states and cities agreed at the Vienna Ministerial Conference and signed the Final Act. It was unanimously adopted by the Federal Assembly on 8 June 1820 and thus entered into force as the second, equal basic law of the Confederation.
At the European level, the Confederation was to ensure peace and balance. Not least, the military constitution served this purpose. As a whole, the Confederation was capable of defending itself from the outside by creating a federal army out of contingents from the member states, but due to its structure it was not capable of attacking.
The guarantor powers were Austria, Prussia, Russia, Great Britain, Sweden, Portugal and Spain. In the event of violations of the contents of the treaty by individual member states, they considered themselves entitled to intervene in the internal affairs of the Confederation. This was the case, for example, in 1833 in connection with the Frankfurter Wachensturm, when federal troops occupied the city. This led to protests from the British and French governments, who considered this to be a violation of the guaranteed sovereignty of the individual states.
The aforementioned membership of foreign kings also placed the Confederation within the European community of states. Like the fact that a large part of Austria and also a significant part of Prussia lay outside the territory of the Confederation, it contradicted the demand for the creation of a nation-state that was emerging under the influence of nationalism. That is, the membership of princes of foreign states contradicted the nation-state principle that was gradually taking hold.