The "Dark Age" in the Indian Empire was a period known for a series of rebellions that occurred against the ruling Kushanas. This happened due to the lack of legitimacy by them during the beginning of the 4th century. This created many small kingdoms within the provinces of India and fractured the empire. A lot of unregulated commerce happened during these provinces and there was little to no control by the Empire.
However, when Samudragupta rose to power, he started a campaign to unify the territories of India. Gradually annexing province by province as he went through them. This brought order as the trade was now regulated by one only entity which was the Empire.
D. because the treaty had nothing to do with africans, neither independent nations in the west, and not all the alliances were in Europe
They failed because nobody cared about the railroad. The railroad had to be a government project with leases to companies but the government was too much involved in the slavery issue that it didn't have time to deal with railroads. That's why railroads boomed after the civil war ended.
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Choice A is wrong because only 26 presidents have served in the military.
Choice B is wrong because not all presidents have been governors.
Choice D is wrong since James Buchanan and Grover Cleveland were not married.
Therefore, Choice C is the correct answer.
