Answer:
Hitler's infamous secret book, "Mein Kampf" (My Struggle), provides an insight into his political ideology and future foreign policy moves. The book outlines his views on race, nationalism, and territorial expansion, which ultimately led to the annexation of Austria, the invasion of Poland, and the start of World War II. In Mein Kampf, Hitler describes his belief in the concept of Lebensraum, or "living space," which called for the acquisition of territory for the German people to expand and prosper. This ideology would ultimately drive his aggressive foreign policies and conquests in Europe. Additionally, the book highlights Hitler's anti-Semitic views, which culminated in the Holocaust and the genocide of millions of Jews during the war. Overall, Hitler's secret book serves as a chilling reminder of the dangers of extremist ideologies and the devastating consequences that result from their implementation.