After World War 1, several dictators rose to power in Russia, Germany, and Italy. In Russia, Vladimir Lenin led the Bolsheviks and became dictator after the execution of Czar Nicholas II. In Germany, Adolf Hitler led the Nazi party and declared himself dictator after gaining power. In Italy, Benito Mussolini led the Fascist party and was appointed leader after marching on Rome. These dictators consolidated their control and rebuilt their militaries, undermining efforts to prevent future wars through pacts and the League of Nations.