In September 1939, what fundamental change occurred in the camps? A. Sentences were shorter.
B. Labor was harder.
C. Food rations were cut.
D. Internment was now indefinite.
E. New populations were incarcerated.

On July 28, 1914, one month to the day after Archduke Franz Ferdinand of Austria and his wife were killed by a Serbian nationalist in Sarajevo, Austria-Hungary declares war on Serbia, effectively beginning the First World War. These 2 countries HATED each other.

While Austria Hungary brought Germany as their ally,

Siberia bought Russia as theirs.

This sparked World War I

This was the most similar incident I could think of as an answer to your question,

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