He sent thousands of Native Americans to their deaths on The Trail of Tears.
The Bessemer process was the first inexpensive industrial process for the mass-production of steel from molten pig iron. The process is named after its inventor, Henry Bessemer, who took out a patent on the process in 1855. The key principle is the removal of impurities from the iron by oxidation with air being blown through the molten iron. Steel was produced in great quantities before Bessemer's invention, but its quality varied widely. The need to constructing large machines, and large structures, such as suspension bridges required high-quality steel, and it was only possible because of Bessemer's invention.
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The most important factors fueling the trade was Europe's desire for raw materials and the need of people in the Americas for labor. Hope this helps
America fought the revolution to break free from imperial rule under Britain, so it wouldn't be right (It would be completely hypocritical) if America were to convert to be an imperial rule over someone else, being the Philippines.