 The Tripartite Pact stated that if any country declared war on one of the Axis countries, the other two would also declare war on those countries.Another reason, historians saw, is that the policies of Hitler were overly aggressive; not only did Hitler preach war with France and the Soviet Union, but he followed a careful pre-made plan of expansionism.Additionally, the events that took place in unveiling of the war such as the Remilitarization of the Rhineland, Anschluss, and the German involvement during the Spanish Civil War, showed that Hitler was anticipating the possibility of war and intentionally gearing up for it.