I believe it's D. They spread industrial technologies and products across wide areas.
Because industrialization lead to a work force which eventually turned into a militarism because the work force could now make their own amo and guns which they didn't have to rely on other countries <span />
The answer is B. they were looking for work.
Secretary of State John hay was an advocate of "<span>A. an open door with China" (also known as an "open door policy" since by this time China had become a powerful economic force. </span>
