The notable outcome of the Treaty of Tilsit following the Napoleonic Wars was the significant territorial and political changes in Europe. Signed in 1807, the treaty established an alliance between Napoleon and Tsar Alexander I of Russia, leading to the division of Europe into French and Russian spheres of influence. This agreement allowed France to consolidate control over much of Europe while restraining the power of Prussia. The treaty marked a pivotal moment in shaping European geopolitics, leading to further conflicts and the eventual rise of nationalism across the continent.