You don't even need to talk to someone. Pick up any book on European colonialism, the Roman Empire, Japanese imperialism, Chinese Imperial dynasties, medieval S

You don't even need to talk to someone. Pick up any book on European colonialism, the Roman Empire, Japanese imperialism, Chinese Imperial dynasties, medieval South Asia, pre-Islamic Persian empires, etc etc. Reddit's r/askhistorians is a great reference for sources on the more popular topics.