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.
Though the Constitution does not expressly provide for any alternative to the Article II treaty procedure, Article I, Section 10 of the Constitution does distinguish between treaties (which states are forbidden to make) and agreements (which states may make with the consent of Congress).