1. The Crimean War weakened Russia and destroyed the Concert of Europe, allowing for national unification in Germany and Italy in the late 19th century. 2. Italian unification was led by the Kingdom of Piedmont and figures like Cavour and Garibaldi, culminating in the capture of Rome and making it Italy's capital in 1871. 3. German unification was driven by Prussia and Otto von Bismarck through military victories over Austria and France, forming the German Empire under Prussian leadership in 1871.