What are three factors concerning the open door policy? Plzz help ASAP

The 1899 Open Door notes provided that (1) each great power should maintain free access to a treaty port or to any other vested interest within its sphere, (2) only the Chinese government should collect taxes on trade, and (3) no great power having a sphere should be granted exemptions from paying harbour dues

Explanation:

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c) legal battles last five weeks after the election due to the narrow victory in several states.