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.
The other principal guarantee in Article IV, Section 4, is that the federal government will assure the states a Republican Form of Government. The guarantee of protection from domestic violence may be treated as part of the republican guarantee. The assurance of a republican form did not appear in the Articles of Confederation.