Can you tell me a moment in history where two nations hate each other and these nations ask a third-party nation to help them eradicate the other. If the third party nation helps defeat the other nation, the third party nation gets to trade and get benefits from the nation they helped.

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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the indians crossed artificial boundaries, setting the stage for conflict

the correct answer is b