There are a couple of reasons for why the empire didn't last. One of those reasons is that the empire was too great (big). Because the empire was too huge, it was divided into different parts after Alexander's death. He also didn't have an heir to the throne, so when he died, officials fought for power and to become king, which also contributed to the fall of the empire as well.
The United States. Americans formed multiple military campaigns in the islands located in the pacific to drive back the Japanese. Eventually, with the detonation of two nuclear bombs, we successfully pacified the Japanese threat.
Answer:
Russia
Explanation:
most economic developed country
