Why weren't the Silk Roads kept open after the fall of the Roman Empire and Han Dynasty? A:The Mongol Empire captured almost all of Asia. B:The Chinese and Romans were the only cultures who had been using the Silk Roads. C:It was expensive to keep troops and forts along the roads to keep them safe. D:They were- the Silk Roads never closed.

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Which statement best describes standard oil in the late 1800s? standard oil controlled only a small number of the nation’s oil refineries. standard oil was a single business that operated in a small region. standard oil controlled only the means and methods of oil production. standard oil owned ninety percent of all oil refineries in the united states.

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