Imperialism hurt European nations by slowing trade and development of new and recent industries.
Answer:
This is as much as I know about the topic.
The British weapons were superior because they had more advanced technology than the Americans had been exposed too.
The Open Door Policy is a term in foreign affairs initially used to refer to the United States policy established in the late 19th century and the early 20th century, as enunciated in Secretary of State John Hay's Open Door Note, dated September 6, 1899 and dispatched to the major European powers.[1] The policy proposed to keep China open to trade with all countries on an equal basis, keeping any one power from total control of the country, and calling upon all powers, within their spheres
I believe it might be Ford (Henry J. Ford).
