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.
Because the soviets converted much of the available farmland in Asia in to white gold cotton fields
If i remember correctly, the people thought (and were right) that the states would become more like their own mini countries, this did end up happening, where the states didnt pay taxes to the country and the country didnt have the right to take it, this led to the constitution to be written, taking out the articles of confederation
