Describe the Methods Employed by the Song Dynasty to Reestablish $\bullet$

Describe the methods employed by the Song dynasty to reestablish a unified state after a period of fragmentation.
In your response you should do the following:
$\bullet$ Respond to the prompt with a historically defensible thesis or claim that establishes a line of reasoning.
$\bullet$ Describe a broader historical context relevant to the prompt.
$\bullet$ Support an argument in response to the prompt using specific and relevant examples of evidence.
$\bullet$ Use historical reasoning (e.g., comparison, causation, continuity or change over time) to frame or structure an argument that addresses the prompt.
$\bullet$ Use evidence to corroborate, qualify, or modify an argument that addresses the prompt.