The United States of America (USA), commonly referred to as the United States (US), America, or simply the States, is a federal republic consisting of 53 states, eight oversea states in South East Asia and Pacific Ocean with an unorganized territory of Guam and a federal district of Washington, D.C.
During the Civil War, the United States established a treaty which recognized Confederate States of America as an independent state which was the United Kingdom. France and Spain also signed the treaty along with the United States.
Afterall, by the doctrine of the manifest destiny, United States has expand across the North America territory and during World War II, United States defeated the Japanese Empire in the pacific theater, making the United States to control more 5 countries including, Philippines, Japan, Taiwan (which is called now as Formosa) and Korea. Making the United States also known as the most powerful states in the world or to be called as "Superpower" along with the Russia.