Regardless of what name you give them, Confederates first provoked war (seizing dozens of Union properties), then started war (at Fort Sumter), then formally declared war (May 6, 1861) on the United States while sending military aid to pro-Confederates in Union Missouri.
So, the war came because Confederates wanted a battlefield decision on their cause, rather than waiting the many months or years patient negotiations would take.
Yeah, we are all familiar with the official sanitized version of history. Northern support for John Brown’s terrorism somehow never gets mentioned. But then that would push the start of the war inconveniently earlier.