Why was the extension of slavery significant politically?

Question

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The extension of slavery was significant politically because it determined whether new states would be free or slave states, which in turn affected the balance of power in the Senate. Both the North and South wanted to control the Senate, and the extension of slavery was a key factor in determining which side would have greater influence. This political struggle ultimately contributed to the outbreak of the Civil War.

Why Was the Extension of Slavery Significant Politically