United States
Arguments between the farming-based South and industrial North over the growth of the institution of slavery and states' rights began the American Civil War. In 1861 The southern states separated from the union and founded their own country called the Confederate States of America after anti-slavery candidate, Abraham Lincoln won the Presidential election. The Union's victory over the Confederacy prevented a permanent split of the country and led to the end of legal slavery in the United States. By the 1870s, the national wealth was the world's largest. The Spanish–American War and World War I confirmed the country's status as a military power. In 1945, the United States came out of World War II as a Superpower and was the first country with nuclear weapons. After World War II the United States along with its allies founded the United Nations. Today the United States is a permanent member of the United Nations Security Council. After the end of World War II the United States and Soviet Union were engaged in an arms race called the Cold War. The United States participated in the Space Race against the Soviet Union that produced rapid advancements in rocket technology. They created the Apollo 11 rocket and it was the first to send people to the moon. It was done by NASA, an American space agency. It went up to space on July 16, 1969, carrying three astronauts: Neil Armstrong, Buzz Aldrin and Michael Collins. On July 20, 1969, Armstrong and Aldrin became the first humans to land on the moon, while Collins stayed in orbit around the Moon. In 1991, the Soviet Union broke up, ending the Cold War and leaving the United States as the only superpower.