the Borders
state border.
State boarder
On maps, black lines between states represent boundaries or borders, where one state stops and the others starts. These are also called state lines.
on a map,what do black lines between states usually represent? state boundries
The black lines mean it is a state boundary.
equilibrium between two states
I think you're talking about the borders of the states. Sometimes, between countries, if normal borders are solid lines and you see dotted lines in some places, you can see in the map key that the dots might mean a disputed border (like currently for Somalia).
Usually they indicate the borders between the states.
usually it's state boundaries
Couplets are a pair of lines of poetry that are usually rhymed and have the same meter. They often express a complete thought or idea within the two lines.
State boarder
horizontal lines represent latitude and vertical lines represent longitude