How do you draw nation borders?

[NeonKnight]

Not sure what you mean. Do you mean, how do we draw it on the map (colors, style, etc) or how do we place them/put them?

If you mean the latter, historically, national borders often followed geographical features. Rivers, Mountain Chains, Edge of a marsh/swam, coast or lake shore. After that, borders were more fickle, maybe loosely represented as a day's ride from this or that town/castle.

[Aenigma]

Not sure what you mean. Do you mean, how do we draw it on the map (colors, style, etc) or how do we place them/put them?

I mean the borders themselves. Do you just draw a line? Do you use dots? Dashes? What kind of markings?
Pardon for not expressing myself sufficiently in the first post.