What event sparked World War II?

• A. The invasion of Poland by Germany on September 1, 1939
• B. The attack on Pearl Harbor
• C. The assassination of Archduke Franz Ferdinand
• D. The Battle of Britain

Answer: (A)

The event that sparked World War II was Germany's invasion of Poland on September 1, 1939. This bold act of aggression violated Polish sovereignty and demonstrated that Hitler intended to redraw Europe by force, ending the era of appeasement. In response, Britain and France declared war on Germany a couple of days later, marking the beginning of a large-scale conflict across Europe.

While other events are significant in the broader war, they did not start World War II. The attack on Pearl Harbor in December 1941 brought the United States into the war, but the fighting had already begun in Europe. The assassination of Archduke Franz Ferdinand triggered World War I, not World War II. The Battle of Britain was a major campaign during World War II, but it occurred after the war had already begun.