In light of Rick Perry's insane comments about secession and the conservative fruitcakes actively nodding their heads with him, I offer the words of one of our greatest Presidents, Abraham Lincoln, from his inauguration speech:
Descending from these general principles, we find the proposition that, in legal contemplation, the Union is perpetual, confirmed by the history of the Union itself. The Union is much older than the Constitution. It was formed in fact, by the Articles of Association in 1774. It was matured and continued by the Declaration of Independence in 1776. It was further matured and the faith of all the then thirteen States expressly plighted and engaged that it should be perpetual, by the Articles of Confederation in 1778. And finally, in 1787, one of the declared objects for ordaining and establishing the Constitution, was "to form a more perfect Union." But if [the] destruction of the Union, by one, or by a part only, of the States, be lawfully possible, the Union is less perfect than before the Constitution, having lost the vital element of perpetuity.
It follows from these views that no State, upon its own mere motion, can lawfully get out of the Union, -- that resolves and ordinances to that effect are legally void, and that acts of violence, within any State or States, against the authority of the United States, are insurrectionary or revolutionary, according to circumstances.