Which could be considered an act indicating acceptance of the social contract

Need plz? due in 10 will give brainliest which of the following was the most significant aspect of revel's election to the senate? a.his election showed that the u.s. would quickly move past the civil war. b.his election to uphold the thirteenth and fourteenth amendments which gave freed slaves citizenship and voting rights. c.his election demonstrated the states were united in a union once more. d.his election was the first step in opening doors for other african-american political leaders.

4. any area in which one nation has power over another; i.e. - this happened to china when it was defeated by japan

Which would be good historical evidence when studying manifest destiny?