What was the name of the battle tactic that saw soldiers living in trenches protected by mines and barbed wire?

After the supreme court’s ruling on the dred scott case, many people in the north believed that a. slavery might become legal everywhere. b. slavery might be banned everywhere. c. formerly enslaved people would move to the north. d. formerly enslaved people would stay in the south.

Which of the following did the west specifically want? high tariffs easy bank credit cheap public land internal improvements at national expense greater access to voter registration slavery choose multiple

List three reasons why explorers began to explore new, and old areas. [[ps: doesn't explicitly say where. i think it's more in general.