Why was the extension of slavery significant politically?

Question

Quizplus · Accepted Answer

The extension of slavery was significant politically because it directly related to the balance of power in the Senate. Both the North and South wanted to control the Senate, and with each new state that was admitted to the Union, the balance of power was at stake. The extension of slavery became a key issue because it was seen as tipping the balance of power between free and slave states, and ultimately contributed to the outbreak of the Civil War.

Why Was the Extension of Slavery Significant Politically