First of all, there is something wrong with your formulation. It should be from 2000 BC to 1000 BC ... Is this question too broad?

According to the viewpoints of Stavri and Anoos in A General History of the World, in the second millennium BC, Eurasia was in a turbulent period of nomadic invasion, the overthrow of the ancient empire and the disintegration of the old social system. During this period, nomadic people were very active, and they took the grassland in the northern Caspian Sea as their base and attacked everywhere. A typical example is that in the 6th century BC/kloc-0, the Hittites in the two river basins quickly retreated northward after the destruction of Babylon, leaving Mesopotamia to Gassett, and the Yellow River basin destroyed the summer. Around 2000 BC, every civilization center in Eurasia was invaded by nomadic people to varying degrees. At the same time, in the civilized centers of the Euphrates and Tigris rivers, the Hittites and Gassett people of Semitic and Indo-European languages, and the Babylonians who spoke Semitic language who established the new kingdom of Babylon did not enter Mesopotamia on the basis of clear boundaries. Later, the Amorites gradually conquered the whole Sumer. During the Sumer Renaissance, Sumerian tribes still infiltrated and encroached on Akkad and Sumer. This leads to the next question.

This period is also a crucial period for national integration and cultural and technological inheritance and transformation. For example, the Sumerians created vehicle transportation around 3200 BC, and the Egyptians learned to use wheels from their contact with Mesopotamia around 1700 BC (in 6500 BC, the residents of Mesopotamia could trade obsidian with Armenia for a long distance, and they could also get copper from the Asian Games in Anatolia, which was twice as far away. The civilization of the American continent is closed, so it was not until Europeans introduced cars that Native Americans knew about vehicle transportation, except, of course, toys for Peruvian children. For example, there is no essential difference between the Babylonian culture in Cuba and the Sumerian culture in front of it. Amorites replaced Sumerian with their Semitic dialects, but they inherited all the cultural heritage except language. In the three centuries after the Hittites attacked Babylon, Gassett ruled most of southern Mesopotamia. Gassett people are content to use cuneiform, adopt Babylonian management methods, and even worship Sumerian and Babylonian gods. Different from the inheritance of culture and technology is the development and transformation of iron weapons, two-wheeled chariots with spokes, war horses and other systems and technologies, which are brought by nomadic people.

Generally speaking, this period is a transitional period and a crucial period for classical civilization to replace ancient civilization. Taking the two river basins as an example, the manifestations are not only military politics and regime change, but also culture and technology, exchange and development, ethnic migration and flow. This period is also a period of great development for Indo-Europeans. Based on this great national migration, Indo-Europeans have basically established a solid position in Europe and West Asia. From the perspective of general history, it is the beginning and end of a period, after which classical civilization almost completely replaced ancient civilization.

At work, I didn't have time to contact history for many years, and I came across this topic by accident. Refer to other historical materials and have a look again. I hope you can analyze it yourself. The "standard answer" of China's history education has been endangering history education for many years ... In fact, we can learn from western history education and build our own historical logic through imaginative thinking. I might as well write a paper. Come on!