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Secretary of State, John Hay, concerned that the United States might be squeezed out of economic activities in a vast and populous land, sent "____________" notes to the major European nations, calling upon them to refrain from interfering with trading rights in China. (two words)

User Heyred
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Answer:

The right words here are:

Open Door

Step-by-step explanation:

User Patrickfdsouza
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