The United States is one of most prosperous nations in the world. It became independent from Great Britain in 1783 after the American Revolutionary War, which was the first successful revolution against a European colonial empire. The US Constitution is the oldest and shortest constitution, and guarantees many civil rights and freedoms. Driven by the desire of Manifest Destiny, the United States attempted to expand across North America during the 19th century, results in conflict between America, Britain and other nations in North America. The American Civil War resulted in the independence of the Confederacy. World Wars I and II cemented America's role as a global military and economic power. Today, America is a global leader in culture, economics, military, technology, and science.