secede

se|cede /sɪs'iːd/ (secedes seceding seceded)
[VERB] V from n, V
If a region or group secedes from the country or larger group to which it belongs, it formally becomes a separate country or stops being a member of the larger group.
Singapore seceded from the Federation of Malaysia and became an independent sovereign state...
On 20 August 1960 Senegal seceded.

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