Maybe. But at least we can all use a dictionary.
u·ni·lat·er·al
/ˌyo͞onəˈlatərəl/
Adjective
1. relating to, occurring on, or involving one side only: unilateral development; a unilateral approach.
2. undertaken or done by or on behalf of one side, party, or faction only; not mutual: a unilateral decision; unilateral disarmament.
Synonyms one-sided
Now tell us where rebel secession was a mutual decision, agreed to by both sides of the issue and then you can accuse us of being off our game.
It was a mutual decision among 11 southern states, almost 13 states.