Question

What is the act of separating from a nation and becoming independent?

Answer 1

It could be Independence?

Answer 2

Answer:

The act of separating from a nation and becoming independent is called secession or declaration of independence.

Explanation:

According to https://en.wikipedia.org/wiki/Secession, secession or declaration of independence is the withdrawal of a group from a larger entity, especially a political entity.

It is a process that begins when a group proclains the act of secession or declaration of independence; it may be a peaceful or violent movement, but its outcome is a new political entity, totally independent.