Why did leaders disagree about the south rejoining the union?

the answer is b.2008 and 2012 were presidential election years.

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.