It's famous for its wide array of popular tourist destinations, ranging from the skyscrapers of Manhattan and Chicago, to the natural wonders of Yellowstone and Alaska, to the warm, sunny beaches of Florida, Hawaii and Southern California. The United States of America (USA or U. S. A. , US or U. S. ) always attracted everyone around the world.
United States is a federal republic consisting of 50 states and a federal district. The 48 contiguous states and Washington, D. C. , are in central North America between Canada and Mexico. The state of Alaska is the northwestern part of North America and the state of Hawaii is an archipelago in the mid-Pacific. Over 318 million people at 3. 80 million square miles of the United States, and the geography and climate is also extremely diverse.
From American Revolutionary War and The Declaration of Independence to World War II, USA's strength more and more powerful. It is the first country to develop nuclear weapons, the only country to use them in warfare, and as a permanent member of the United Nations Security Council.
As a global superpower country, the United States has always played an important role in the world. The USA has the world's largest national economy and has been a leader in scientific research and technological innovation since the late 19th century. Until today, United States continues to move forward.