Secession is the withdrawal of a group from a larger entity, especially a political entity, but also from any organization, union or military alliance. Some of the most famous and significant secessions have been: the Southern States seceding from the Union - which is one of the causes for the American Civil War, the former Soviet republics leaving the Soviet Union after its dissolution, Texas leaving Mexico during the Texas Revolution, Biafra leaving Nigeria and returning after losing the Nigerian Civil War, and Ireland leaving the United Kingdom. Threats of secession can be a strategy for achieving more limited goals. It is, therefore, a process, which commences once a group proclaims the act of secession (e.g. declaration of independence). A secession attempt might be violent or peaceful, but the goal is the creation of a new state or entity independent from the group or territory it seceded from.