Answer: The balance of power in Eastern Europe was realigned in 1721 with the Peace of Nystad.
Explanation: The Peace of Nystad was a treaty signed in 1721 between Sweden and Russia, ending the Great Northern War. The war had been fought between Sweden and a coalition of Russia, Denmark-Norway, and Saxony-Poland-Lithuania over control of the Baltic region.
The treaty was signed in the town of Nystad (now Uusikaupunki) in Finland and resulted in significant territorial gains for Russia, including control over the Baltic provinces of Livonia, Estonia, and Ingria. The treaty also recognized the ascension of Peter the Great of Russia as the dominant power in the region, marking a shift in the balance of power in Eastern Europe.
The Peace of Nystad was a significant milestone in the history of the region, marking the decline of Sweden as a major power and the rise of Russia as a dominant force in Eastern Europe.