Nickname:Land of the Free Capital City:Washington D.C. Date of Creation:July 4, 1776 Population:272,690,813 Area:9,629,047 sq. mi. Highest Point:Mt McKinley, Alaska 20,320 feet Bird:Bald Eagle Flower:American Beauty Rose Tree:Cherry Tree Song:The Star Spangled Banner The United States of America was founded on July 4, 1776 after Thomas Jefferson wrote the Declaration of Independence. In 1789 a formal constitution was created, with Delaware being the first state to adopt it. Hawaii was the 50th, and thus far, final state to join the union. The National Anthem is the Star Spangled Banner, which was written by Francis Scott Key. The first President of the United States was George Washington.