Why was slavery more important, in general, to Southerners than to Northerners?

Sea exploration became important during the late middle ages because europeans most likely wanted to

What were the purposes of salt? check all of the boxes that apply. -to achieve peace -to protect the security of the united states -to form an alliance against communist nations - to stop the nuclear arms race - to give the united states an advantage over the soviet union

Which statement is true of both presidential and parliamentary systems of government?