The term 'Confederation' is used to describe a variety of different types of organizations. A CONFEDERACY is an ALLIANCE of independent states or organizations that are united for a common purpose. A COALITION is a GROUP of people or organizations that have joined together to achieve a shared goal. An ASSOCIATION is a formal organization of people with similar interests or goals. A GROUP is a collection of individuals who have come together for a common purpose. A LEAGUE is an organization of people or nations that have joined together for mutual benefit. A UNION is an organization of workers that have joined together to protect their rights and interests. An ALLIANCE is a formal agreement between two or more parties to cooperate for mutual benefit. The SIOUX were a CONFEDERACY of Native American tribes that lived in the Great Plains region of North America. A BAND is a small GROUP of people who share a common interest or purpose. A bund is a German term for a political or economic ALLIANCE.