What challenges did leaders of the song dynasty experience

Northern neighbors crossed into Northern China and occupied large Chinese territory. Song rulers were forced to move the imperial court south to Hangzhou, the Song also lost control over Tibet. Mongols also overthrew the Song and set a new Mongol dynasty

Explanation:

Explanation:

Rome : was a republic, was led by senate, had a bicameral assembly

Athens: had a council of 500 , was a direct democracy, allowed all citizens to vote