Answer :
Final answer:
World War II began with the German invasion of Poland on September 1, 1939. This invasion prompted Britain and France to declare war on Germany two days later. Prior events of German expansion were marked by the annexation of Austria and the Sudetenland, which contributed to the escalating conflicts in Europe.
Explanation:
Event that Started World War II
The event that is widely recognized as the start of World War II was the German invasion of Poland on September 1, 1939. This invasion marked a significant escalation in tensions as it violated Poland's sovereignty and dashed hopes for peace following a series of aggressive moves by Germany in the late 1930s.
Prior to the invasion, Adolf Hitler had annexed Austria and demanded the Sudetenland from Czechoslovakia, both of which were appeased by European powers like Britain and France. However, after these events, when Hitler began making demands on Poland, the situation escalated into conflict. The invasion was executed swiftly, and just two days later, Britain and France declared war on Germany, formally initiating World War II.
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