Dìguó de shuāibài shì duō zhǒng yīnsù zàochéng de.
The decline of the empire was caused by multiple factors.
Tips
usage
衰败 typically describes the decline of empires, economies, or civilizations — it carries a weightier, more irreversible sense than 衰退 (economic downturn) or 衰落 (decline in influence).