The reason why Southerners were more likely than Northerners to support the Mexican-American War is because an American victory in the war would lead to more territory in the South being gained (territory once belonging to Mexico).
i dont know what you mean to put a statement in a question and answer it yourself.
<u> B. In an authoritarian government, the leaders of the government have absolute power.</u>
An authoritarian government is marked by the concentration of power in a small elite or leaders that exercise power arbitrarily, without limits, and without taking account on any body of law or existing Constitution, usually disrespecting people's right of having fair elections, freedom to express, among others. In opposition to this, in a constitutional government, the leaders' powers are limited. And these leaders are elected, kept in power and limited according to the laws of a given nation or area.