Can you identify a foreign policy action of one developed nation that drastically affected a developing nation?

Serious answers please, asking for educational purposes only.

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OnlyRhonda · 36-40, F

I believe that Germany's foreign policy in invading Poland in 1939 affected quite a few others as it led to the Second World War.

England's war with France in 1513 got Scotland involved

The Balkan squabbles of 1914 created the First World War as well