The United States of America, often referred as US or USA or simply America, has 50 states and a population of over 327 million people. USA has a total area of 3.8 million square miles (9.8 million km2), and is the world's third or fourth largest country by total area. The capital of USA is Washington, D.C., and the largest city by population is New York.
The President of USA(POTUS) is the head of state and head of government of the United States of America. The President of USA is indirectly elected to a four-year term by the people through the Electoral College. The President directs the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces. When the office was established in 1789, the first President, George Washington, won a unanimous vote of the Electoral College.
The President of USA is honored as one of the world's most powerful political figures. The President of USA is responsible for the world's most expensive military, which has the second largest nuclear arsenal. The President of USA also leads the nation with the largest economy by nominal GDP. The President of USA possesses significant domestic and international power. The executive power of the United States is vested in the The President of USA. USA Presidents lists the Presidents Of USA since 1789 when the office was first established.

USA Presidents since the establishment of office in 1789.

• Form of Government: Republic (Democracy)
• Capital: Washington D.C.
• Size: 9,826,675 square kilometers (3,794,083 square miles)
• Population: 308,745,538 (U.S. Census 2010)
• Time Zones: Eastern, Central, Mountain, Pacific, Alaska, Hawaii-Aleutia
• Anthem: “The Star-Spangled Banner” Lyrics/Music by: Francis Scott Key/John Stafford Smith
• March: “Stars and Stripes Forever” John Philip Sousa
• Bird: Bald Eagle
• Flower: Rose
• Tree: Oak
• Motto: In God we trust
• Date of Independence: July 4, 1776
• Largest State: Alaska
• Smallest State: Rhode Island
• Highest Elevation: Mount McKinley, Alaska (20,320 feet above sea level)
• Lowest Elevation: Death Valley, California (282 feet below sea level)
• Border Countries: Mexico, Canada