2. Writing: The invention of writing allowed people to record their thoughts and ideas. This led to the development of literature, philosophy, and science.
3. Trade: Trade allowed people to exchange goods and ideas with other cultures. This led to the spread of new technologies and the development of new civilizations.
4. Government: The development of government allowed people to live together in peace and order. This led to the establishment of laws, the protection of property, and the development of social institutions.