Why was the united states willing to go to war with spain over cuba

What is the area of the trapezoid shown ?

Which of these would have been a goal of the ku klux klan in the south during reconstruction? a) registering more potential rural voters b) making sure reconstruction went smoothly c) assisting the scalawags and carpetbaggers d) restoring southern democrats to political power

Can someone me write a paragraph on this topic i feel confused