ENG: Secession in the United States can refer to secession of a state from the United States, secession of part of a state from that state to form a new state, or secession of an area from a city or county.
Attempts at or aspirations of secession from the United States have been a feature of the country's politics since its birth. Some have argued for a constitutional right of secession and others for a natural right of revolution. The United States Supreme Court ruled unilateral secession unconstitutional while commenting that revolution or consent of the states could lead to a successful secession.
The one serious secession movement was defeated in the American Civil War. In 1860 and 1861, eleven of the fifteen southern states where slavery was legal declared their secession from the United States and joined together as the Confederate States of America. It collapsed in 1865 after losing the war with the northern states.
A 2008 Zogby International poll revealed that 22% of Americans believed that "any state or region has the right to peaceably secede and become an independent republic."