There are many differences and distinctions between the "early civilization" and "classical civilization" periods. Some of the distinctions of the classical civilizations include the rise of empires, central government, and conquest of other nations. While the early civilizations, were mainly a period of discovery and new constructions, and agriculture.
             During the early "river valley" civilization period, people from certain areas were just beginning to come together, and form allegiances and city-states. This was the time of Mesopotamia, Egpyt, and early China. This was when people first started learning about agriculture, and plant and animal domestication. People for the first time had started moving away from hunter-gatherer tribes, and settling down in one area. They had begun farming and raising livestock as a way of life.
             However, the period of the "classical civilizations" was a period of empires. The Persians, the Greeks, the Romans, China, and India had begun to rise as central powers. Emperors and Kings set out to form centralized governments, to conquer more land and expand their power. It was the time of philosophy and art. It was when language was flourishing. It was a time of relatively fast human progress.
             With the start of the early civilizations, people had recently discovered farming and domesticating animals. Agriculture itself was more of an accidental discovery. It started out with simple things such as animal droppings fertilizing the soil, and allowing for plant and crop growth. With more and more people discovering this concept, and more and more people migrating away, agriculture was spread across the regions relatively fast. This gave people a reason to move away from hunter-gatherer societies, and be able to settle in one area.
             With people being settled into one area, they became prone to more attacks from outsiders looking to loot and steal. This eventua...