Hello.
The answer is: C. He was the last emperor of the Western and Eastern Empire.
there was no one emperor after his death only the one in east and one in west according to his wish, Theodosius the Great, was Roman Emperor from AD 379 to AD 395, as the last emperor to rule over both the eastern and the western halves of the Roman Empire.
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The transcontinental railroad. Because of it, goods were able to be exchanged between the west and east and Chinese immigrants mainly worked on it.