"The Union was formed by the voluntary agreement of the States, and in uniting together they have not forfeited their nationality, nor have they been reduced to the condition of one and the same people. If one of the States chose to withdraw from the compact, it would be difficult to disprove its right of doing so, and the Federal government would have no means of maintaining its claims directly either by force or right." --Alexis de Tocqueville, Democracy in America.
