Please help me 10 points per person

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.

What role did the alliance system play in preventing austria-hungary and serbia from coming to a compromise settlement?

According to the map, most mining occurs in the a.northern b.southern c.eastern d.western