What is one of the main issues/problems prior (before) to the civil war? Why was the south trying to break away from the union

Woodrow wilson called the supreme court "a constitution convention in continuous session." what did wilson mean by this?

The senate differs from the house of representatives in that representatives serve for terms, while senators serve terms. question 18 options: six year, four year four year, six year two year, six year six year, two year

During 1915-1917, u-boats attacked not only enemy ships but also