What became inevitable after the union dissolved(secession)?

What was the official reason given for Virginia's secession from the Union?

That same day, the convention adopted an ordinance of secession, in which it stated the immediate cause of Virginia's declaring of secession, "the oppression of the Southern slave-holding States".

Explanation:

What was the primary cause of secession?

Many maintain that the primary cause of the war was the Southern states' desire to preserve the institution of slavery. Others minimize slavery and point to other factors, such as taxation or the principle of States' Rights.