Answer:
United States affairs??
Explanation:
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<span>Railroads played a large role in improving travel and transportation in the US and Europe, especially in the 18th century.</span>
B. It reunited northern and southern China in the sixth century.
The Sui Dynasty was a relatively short one, it only lasted from 589 AD to 618 AD. Therefore, A. C. and D. are incorrect because the Dynasty was not in power at those times. So, B is correct because it did reunite northern and southern China with its creation in the 6th century.