The central idea shows that the Chinese are not happy that foreigners were making decisions for their country and people.
A central idea simply means the main idea that's contained in the literary work. It's the underlying message in a story.
In this case, the central idea shows that the Chinese are not happy that foreigners were making decisions for their country and people. They weren't happy about the open door policy.
Also, the Chinese have a vibrant culture. This is want makes up their society and makes them unique.
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