The concept refers to the political belief, prominent throughout American history, that individual states possess rights and powers independent of the federal government. These rights, advocates argue, are either explicitly reserved to the states in the Constitution, or are implicitly retained by the states because they are not specifically delegated to the federal government. Historically, assertions of this principle have manifested in various forms, including resistance to federal laws deemed unconstitutional infringements on state sovereignty, such as during the Nullification Crisis and in the lead-up to the Civil War. A contemporary example might involve debates over federal environmental regulations impacting state control over natural resources.
The significance of this doctrine lies in its persistent influence on the balance of power between the states and the federal government. It has served both as a defense against perceived federal overreach and as a justification for actions that contradicted national laws and policies. Understanding the historical context surrounding the promotion of this political position provides crucial insight into major conflicts and debates in American history, including discussions over slavery, civil rights, and the appropriate scope of federal authority.