How might that growth have made jacksons election possible

The election of President Andrew Jackson illustrate the nation’s westward growth that what Andrew Jackson in 1843 famously described as "extending the area of freedom." As more territory was added to the United States in the following decades, whether or not "extending the area of freedom" also meant extending the institution of slavery became a central issue in a growing divide over the interpretation of America's mission.

Explanation:

c is the answer of it but i am not sure