Adolf Hitler's political views were formed during three periods, namely (1) his years as a poverty-stricken young man in Vienna and Munich prior to World War I, during which he turned to nationalist-oriented political pamphlets and antisemitic newspapers out of distrust for mainstream newspapers and political parties; (2) the closing months of World War I when Germany lost the war, as Hitler is said to have developed his extreme nationalism during this time, desiring to "save" Germany from both external and internal "enemies" who in his view betrayed it; (3) and the 1920s, during which his early political career began and he wrote "Mein Kampf". Hitler formally renounced his Austrian citizenship on 7 April 1925, but did not acquire German citizenship until almost seven years later in 1932; thereby allowing him to run for public office. Hitler was influenced by Benito Mussolini, who was appointed Prime Minister of Italy in October 1922 after his "March on Rome". In many ways, Hitler epitomizes "the force of personality in political life" as mentioned by Friedrich Meinecke. He was essential to the very framework of Nazism's political appeal and its manifestation in Germany. So important were Hitler's views that they immediately affected the political policies of Nazi Germany. He asserted the "Führerprinzip" ("leader principle"). The principle relied on absolute obedience of all subordinates to their superiors. Hitler viewed the party structure and later the government structure as a pyramid, with himself—the infallible leader—at the apex.