During the century that followed Pax Romana, Rome had many leaders because men were fighting for power of the empire. This time period is know as "The Crisis of the Third Century ". It was during this time that the Roman Empire almost collapsed entirely because of several combined pressures including civil war, invasions, plague and economic depression.
Nazi Germany's invasion of Poland on 1 September 1939, marked the beginning of World War II. Despite being an Axis power, Italy remained non-belligerent
