Crossing the Silk Road, Marco Polo brought elements of Western culture to the East and Eastern culture back to the West.
Because of his exploration for trade of what is today modern China, Indonesia, Mongolia, Sri Lanka, and India, the east experienced Western culture.
Furthermore, his journeys were documented in the Book of the Marvels of the World which presented to Europeans the Asian cities and countries.
George Washington Bush and another family, the Simmons, moved west on the Oregon Trail, but by the time they got there, a law was past that African Americans could not settle in the Oregon Territory, so instead they moved cross the Columbia River into land owned by both Great Britain and the United states, and the Bush's and five other families created a settlement there called "Bush Prairie."
Bush's experience as a multi-racial (Irish and African) person show the interdependence of people of different races on the western frontier, as well as the difficulties regarding racial prejudice.
Hope this helps.
I would say the answer is B. A is wrong because slavery was just being called for abolition. D is wrong because no women had the right to vote till 1890s.
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The two countries were Germany and Russia.