Leader Henry Clay<span> designed a compromise, which failed to pass in early 1850, due to opposition by both pro-slavery southern Democrats, led by </span>John C. Calhoun<span>, and anti-slavery northern Whigs.</span>
They rejected it because they did not want the United States to get involved in foreign wars.
I think it should be thick and it should be aluminum because aluminum is a good conductor... and i don't think it matters if its above ground or underground.. because if u look outside now most of the wires are above ground but they are starting to make them underground now.. so if u have to pick one just say above ground