Shock, explosions, electrocution
Answer : Proportional representation system
So that you don't get lost from where you're going to and you don't have to go to multiple places to find the one that you are looking for. I hope this helps. Although sometimes it's not necessary because you might know where the place is or someone else is leading you to it. I really hope I helped have a brainly day!! ;)
They are all bodies of water
Made for easier travel transport comunication and expansion west with out these west of Kentucky wouldnt have came into the us till later most likely