The Sierra Club, with over 700,000 members nationwide, is the oldest grassroots environmental organization in the United States. It sees its purpose as preservation, protection, and enhancement of the natural environment.
Article IV, Section 4. This section is called the Guarantee Clause, because by its terms the federal government makes certain guarantees to the states. One of theseâprotection from foreign invasionâcontinued Congress's prior obligation under the Articles of Confederation.
Regardless of how an amendment is proposed, Article V gives Congress authority to direct the mode of ratification. United States v. Sprague (1931). Of the ratified amendments, all but the Twenty-first Amendment, which was ratified by state conventions, have been ratified by state legislatures.