The Seven Years' War, 1756 to 1763, was a global war fought by numerous great powers, primarily in Europe, with significant subsidiary campaigns in North America and South Asia. The warring states were Great Britain and Prussia fighting against France and Austria, with other countries joining these coalitions: Portugal, Spain, Saxony, Sweden, and Russia. Related conflicts include the Third Silesian War, French and Indian War, Third Carnatic War, Anglo-Spanish War (1762–1763), and Spanish–Portuguese War.
Although the War of the Austrian Succession ended with the Treaty of Aix-la-Chapelle (1748), none of the signatories were happy with the terms, and it was generally viewed as a temporary armistice. It led to a strategic realignment known as the Diplomatic Revolution that ended the long-running rivalry between Austria and France. The two declared war on Britain after signing the Treaty of Versailles (1756), with a second agreement in 1757 bringing Prussia into the war.