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Honest question: How US border controls compare to China border controls?

Edit: worded it better.

Of the 25-30 times I have entered China, only once was I asked a question and it was "Are you here on business?".

They are exceedingly polite... Granted it may be because you have to receive a visa prior and the application is pretty extensive.

On other hand, being Canadian I have been grilled several times at both Canadian and US immigration.