In 1754, escalating tensions between Britain and France in North America offered the Empress the opportunity to regain her lost territories and to limit Prussia's ever-growing power. France and Austria put aside their old rivalry to form a coalition of their own; Maria Theresa agreed that one of her daughters, Maria Antonia, would marry the Dauphin of France, and her chief ministers negotiated a military and political pact advantageous to both parties. That drove Britain to align herself with George II's nephew, Frederick II. Their alliance also involved the Electorate of Hanover, which was held in personal union by George, along with George's and Frederick's relatives, who ruled the Principality of Brunswick-Wolfenbüttel and the Landgraviate of Hesse-Kassel. That series of political manoeuvers became known as the Diplomatic Revolution.