What country did not participate in the Seven Years' War?

The Seven Years' War was a global war fought between 1756 and 1763. It involved all five European great powers of the time plus many of the middle powers and spanned five continents, affecting Europe, the Americas, West Africa, India, and the Philippines. The conflict split Europe into two coalitions: one was led by the Kingdom of Great Britain and included the Kingdom of Prussia, the Kingdom of Portugal, the Electorate of Brunswick-Lüneburg, and a few other small German states; while the other was led by the Kingdom of France and included the Austrian-led Holy Roman Empire, including the Electorate of Saxony and most of the smaller German states, the Russian Empire (until 1762), the Kingdom of Spain, and Sweden.

Although Anglo-French skirmishes over their American colonies had begun in 1754, with what became known in the United States as the French and Indian War, the large-scale conflict that drew in most of the European powers was centered on Austria's desire to recover Silesia from Prussia. Seeing the opportunity to curtail Britain's and Prussia's ever-growing might, France and Austria formed a grand coalition of their own, bringing most of the other European powers to their side. Britain aligned itself with Prussia, in a series of political manoeuvres known as the Diplomatic Revolution. However, French efforts ended in failure when the Anglo-Prussian coalition prevailed, and Britain's rise as among the world's predominant powers destroyed France's supremacy in Europe.