August 1–4, 1914: Germany declares war on Russia and France, and invades Belgium, prompting Britain to enter the conflict. The Outbreak of the First Global Conflict World War I, often termed the Great War, formally commenced on July 28, 1914, when the Austro-Hungarian Empire declared war on Serbia.
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July 28, 1914: Austria-Hungary declares war on Serbia. The subsequent two decades, known as the interwar period, were defined by economic instability, political extremism, and unresolved territorial disputes.
The dates marking the start of World War I and World War II represent pivotal moments in modern history, separating eras of colonial competition from periods of total ideological warfare. Japan had been engaged in the Second Sino-Japanese War since 1937, and the Molotov-Ribbentrop Pact signed on August 23, 1939, ensured that Germany would not face a two-front war initially, shocking the international community and paving the way for the partition of Poland.
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The harsh terms imposed on Germany created a climate of resentment that extremist movements, particularly Nazism, were able to exploit. The Start of the Second Global Conflict World War II is generally recognized to have begun on September 1, 1939, when Nazi Germany invaded Poland.
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