In 1860, the southern states highlighted in red would have been least likely to a) use forced labor in its agricultural production. b) vote for abraham lincoln for president of the united states. c) push for expansion of slavery in western states and territories. d) support the notion of "popular sovereignty" in the debate over slavery.

The correct answer is B: vote for Abraham Lincoln for President of the United States.

In 1860, the Southern States highlighted in red would have least likely voted for Abraham Lincoln for President of the United States. It is so because the Southern States in the 19th Century heavily relied on slavery which Abraham Lincoln yearned to finish. He was the first Republican to be voted into presidential office but was also a radical who threw off many southern Democrats.