The Union Between Sweden and Norway was a political alliance that lasted from 1814 to 1905. It was established after the Napoleonic Wars when Norway was ceded to Sweden by Denmark in the Treaty of Kiel. Although the two countries shared a monarch, they maintained separate laws and institutions, leading to tensions over time. In 1905, growing nationalist sentiments in Norway led to the dissolution of the union. A peaceful separation was achieved, and Norway became an independent nation. The union's legacy continues to influence the relationship between Sweden and Norway today.