HELP For what political reason did southern slaveholders care whether new states were free or slave?

The reason can be attributed to the fact that if more states became free, then those states can easily overturn any southern legislation in government that aligned with their pro-slavery views and if more states became slave states, then the South would have a political advantage in the federal and state governments as this would mean more states would push for southern-aligned legislation.

Explanation:

i do not know if this question has options, but a main impact of the federal reserve act of 1913, which created the federal reserve bank, was the international use of the u.s. dollar, which soon became the world's leading currency - particularly during world war i, since many nations around the world asked the united states for money.