Based on historical and political perspective, the thing that led smaller countries, like Italy and Japan, to take over such large countries as Ethiopia and Manchuria is advanced economy and warfare.
Before world war II, smaller countries like Italy and Japan had good economic standards and advanced warfare systems to make larger countries like Ethiopia and Manchuria.
The overtaken of places like Ethiopia and Manchuria by Italy and Ethiopia was through military force and economic war.
Hence, in this case, it is concluded that the correct answer is advanced economy and warfare.
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