Why did the Roman Empire fall?

The answer

The fall of the Western Roman Empire in 476 CE was the culmination of centuries of compounding crises: military overextension across three continents, economic inflation from debased coinage, political instability with over 50 emperors in the crisis-ridden 3rd century alone, and relentless pressure from migrating Germanic tribes. Crucially, the Eastern Roman Empire (Byzantium) survived for another thousand years, suggesting the 'fall' was more of a regional transformation than a total collapse.