system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How it went from the Greeks being a huge power, conquering large parts of the world to then being a 'barbarian people' and the rise of the Roman empire?

I may have worded it wrong. But I'm curious how the ancient Greeks, which as far as I know were a huge civilisation, conquering lots of land (Alexander) to then being essentially a slave nation to the Romans? How did the Greeks fall and the Romans become so large?

Is there like a brief ELI5 time line you could give?
gpt
Alexander was Macedonean and not Greek. In fact Greece as a nation didn't exist until Alexander's death and the rise of the so called Hellenic period. Before that the people we call ancient Greeks consistet of multiple citystates like the polis of Athens or Corinthia. Ancient Greece was a very sophisticated place, but definitely no major military power like Rome. The rise of Rome is an entire different story and very complicated to explain. In short one major advantage the Romans had was their ability to adapt and assimilate technology and aspects from other cultures (like greek philosophy) and the structure and organisation of their warmachine.