In World War I, Japan entered on the side of the Allied Powers and picked off Germany's colonial empire in the Pacific Ocean.
This was probably the high-water mark of Japan's acceptance by the Western powers prior to 1945.
And to this point, Japan had really acted exactly as the various European colonial powers had.
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The answer is Islam spread.
I believe the term you are looking for is called an agora.
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It's too long yr mark my answer as branily dear
The answer is convergent continental-continental