The Treaty of Friendship, Commerce and Navigation Between Argentina and the United Kingdom was an 1825 treaty between the United Provinces of the River Plate (predecessor of modern Argentina) and the United Kingdom). With this treaty, the United Kingdom accepted the 1816 Argentine Declaration of Independence. As the United Kingdom was the most powerful world power of the time, and the United States had announced the Monroe Doctrine, this treaty limited the chances of Spain to reconquer its former colony.