Features of the development of India, China and Egypt BC

India: caste system, the emergence of Buddhism (the oldest of the world religions), there was no external expansion, two centers of civilization (Indus and Ganges).
China: a unified state appeared there quite late, it was created by Qin Shi Huang around 220 BC. and it lasted hardly 14 years. The writing was hieroglyphic, external relations were limited (they were fenced off from the nomads by a great wall), there was no external expansion to distant countries. The ideology was Confucian.
Egypt: the power of the pharaohs, writing in hieroglyphs on papyrus, agricultural civilization on the banks of the Nile, some external expansion, especially after the expulsion of the Hyksos, moved to expansion in the north-east and south.