Many countries in South America work together. 
Many lands in South America work together. 

Many nations in South America work together. 

By 2011, the group was a legal entity. This means it was an official group of nations.
Some countries also left to join a new group. This new group was called PROSUR. Brazil and Ecuador left the union during this time. But things can change. Brazil decided to join UNASUR again in 2023. Colombia also said it would rejoin the group. Neighbors in South America often try to find ways to work together again.
The Union of South American Nations is a group of countries working together. 
The group follows a specific way of working. Leaders first signed a treaty to agree on the rules. This treaty was signed on May 23, 2008, in Brasília, Brazil. The group's main office is located in Quito, Ecuador. To become a legal entity, many countries had to sign the treaty. Uruguay became the ninth state to sign on December 1, 2010. This allowed the group to officially begin its work on March 11, 2011. 
Ideas about a united South America are very old. 
History shows that the group has faced many hard times. 

Because of these disagreements, some countries left to join a new group.
The Union of South American Nations (USAN) is an intergovernmental regional organization. It is also known by the abbreviations UNASUR or UNASUL. This organization brings together various South American governments to work as a collective unit. The primary goal was to increase the regional influence of South American nations. It was also intended to counteract the influence of the United States in the region.
The creation of the union followed a specific legal process. In 2004, leaders signed the Cusco Declaration to announce the South American Community of Nations. They wanted to model this community after the European Union. This vision included ideas like a unified passport and a single currency. On May 23, 2008, leaders signed the UNASUR Constitutive Treaty in Brasília, Brazil. The treaty required a specific number of ratifications to become legally active. Uruguay became the ninth state to ratify the treaty on December 1, 2010. This allowed the treaty to enter into force on March 11, 2011. 
To avoid creating too much bureaucracy, the union followed a unique operating condition. During its first phase, no new institutions were to be created. Instead, the community used existing institutions from previous trade blocs. The headquarters for the General Secretariat was established in Quito, Ecuador. 
Ideas of South American integration have a long history. Between the 15th and 19th centuries, Spanish and Portuguese colonization shaped the continent. After the wars of independence, leaders sought political integration. Francisco de Miranda once envisioned a large federated republic called "Colombia." In the 1820s, Simón Bolívar became a major proponent of federation. He organized the "Amphictyonic" Congress of Panama in 1826 to form a defensive league. However, these early attempts did not result in permanent unions. By the 1990s, Brazil emerged as a powerful economic force in the region. This helped revive the idea of a united South America. 
In recent years, the organization has faced a significant leadership crisis. This began after the term of Secretary General Ernesto Samper ended in January 2017. Member governments could not reach a consensus on a successor. Venezuela, supported by Bolivia and Suriname, blocked the nomination of José Octavio Bordón. This disagreement led to political tension between member states. In August 2017, several nations formed the Lima Group to address concerns regarding the government in Venezuela. 
This political tension caused many countries to withdraw from the union. In April 2018, six nations suspended their membership: Argentina, Brazil, Chile, Colombia, Paraguay, and Peru. These countries argued that the institution was ineffective and too ideological. In 2019, several more countries announced their intention to leave. Brazil and Ecuador joined a new group called PROSUR. Ecuador's president also requested the return of the headquarters building in Quito.
Despite these departures, the political landscape of the region continues to shift. The membership of these organizations is not permanent. For example, Brazil rejoined UNASUR on May 5, 2023, following a change in leadership. Colombia also signaled its intention to rejoin the organization. These movements show how regional cooperation can change based on the choices of individual governments.
Ultimately, UNASUR represents a complex effort to manage regional stability. It connects different political systems and economic goals. While the organization has faced challenges with consensus and membership, its history reflects a long-standing desire for unity. The struggle between different regional blocs like UNASUR and PROSUR highlights the ongoing search for South American leadership. 
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