The course and outcome of this war had the three main rivals dissatisfied with the result, something for which each power is responsible before the door of their allies. Between 1749 and 1755, the politicians of London, Versailles and Vienna realized that their former allegiances were not the best servants of their purpose in a new European war. The results of the Austrian War of Succession showed that Britain no longer considered Austria powerful enough to control French power, but merely built other states such as Prussia. That is why Britain and Prussia agreed in the Westminster Convention of 1756 that Britain would not assist Austria in a new conflict for Silesia if Prussia declared itself ready to protect Hanover (which remained in personal union with Great Britain) against France. Britain felt that with the growing strength of Prussia, it would be better to defend Hanover rather than Austria. In the meantime, Austria was determined to win back Silesia, so that the two allies were with conflicting interests. Maria Therese recognized the futility of a renewed alliance with Great Britain and knew that without a powerful ally (such as France), she could never hope to take over the Silesia of Frederick the Great. A family issue became a European issue reflected by the extension of Habsburg power after 1683 to countries previously held in the Ottoman Empire, due to tensions within the Holy Roman Empire. Another complexity resulted from the fact that the theoretically chosen post of the Holy Roman Emperor had been occupied by the Habsburgs since 1437.
It is the centrifugal forces behind a war that has transformed the traditional balance of European powers; the various rights were, to a large extent, pretexts and were considered as such.  In August 1755, Kaunitz had the Viennese ambassador Starhemberg seek the royal mistress Jeanne-Antoinette Poisson de Pompadour (1721-1764), in the hope of entering into direct negotiations with the French Court. This time, the King of France decided to make the leap and ordered one of Pompead`s protégés, Bernis, to start secret conversations.