Final answer:
The Song dynasty had a weak military, which impacted its stability and led to its downfall. Despite being culturally advanced, they faced military threats and eventually lost control to the Yuan dynasty.
Step-by-step explanation:
A key problem with the Song dynasty was its weak military. Despite being one of the most prosperous and culturally advanced dynasties in Chinese history, the Song dynasty faced numerous military threats from neighboring kingdoms and nomadic tribes. This weakened military power eventually led to the downfall of the dynasty. For instance, their inability to defend against the Mongol Empire ultimately resulted in the Yuan dynasty taking over China.
While the Song dynasty had a relatively strong economy, it faced other challenges such as financial difficulties and corruption. However, weak military was a major problem that significantly impacted the stability and longevity of the dynasty.
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