Question: Windows on the World was a complex of venues on the top floors (106th and 107th) of the North Tower (Building One) of the original World Trade Center complex in Lower Manhattan that included a restaurant called Windows on the World, it operated until 2001 when they were destroyed in the September 11 attacks (also referred to as 9/11) were a series of four coordinated terrorist attacks by the Islamic terrorist group al-Qaeda on which country?

The Twin Towers of the World Trade Center collapsed on September 11, 2001, as a result of being struck by two jet airliners hijacked by 10 terrorists affiliated with al-Qaeda, during the September 11 attacks.  Two of the four hijacked airliners crashed into the Twin Towers, one into the North Tower (1 World Trade Center) and the other into the South Tower (2 World Trade Center).  The collapse of the Twin Towers destroyed the rest of the complex, and debris from the collapsing towers severely damaged or destroyed more than a dozen other adjacent and nearby structures.  The South Tower collapsed at 9:59 am, less than an hour after being hit by the second hijacked airliner, and at 10:28 am the North Tower collapsed.  Later that day, 7 World Trade Center collapsed at 5:21 pm from fires that had started when the North Tower collapsed.  As a result of the attacks to the towers, a total of 2,763 people died.  Of the people who died in the towers, 2,192 were civilians, 343 were firefighters, and 71 law enforcement officers. Aboard the two airplanes, 147 civilians and 10 hijackers also died. <SEP>  The restaurants operated from April 19, 1976, until 2001 when they were destroyed in the September 11 attacks. Windows on the World was a complex of venues on the top floors (106th and 107th) of the North Tower (Building One) of the original World Trade Center complex in Lower Manhattan that included a restaurant called Windows on the World, a smaller restaurant called Wild Blue, a bar called The Greatest Bar on Earth, and rooms for private functions.  Developed by restaurateur Joe Baum and designed initially by Warren Platner, Windows on the World occupied 50,000 square feet (4,600 m²) of space in the North Tower. <SEP>  The attacks killed 2,996 people, injured over 6,000 others, and caused at least $10 billion in infrastructure and property damage. The September 11 attacks (also referred to as 9/11) were a series of four coordinated terrorist attacks by the Islamic terrorist group al-Qaeda on the United States on the morning of Tuesday, September 11, 2001. <ref name="PEARL9/11"> </ref> <SEP> One World Trade Center (also known as 1 World Trade Center, 1 WTC or Freedom Tower ) is the main building of the rebuilt World Trade Center complex in Lower Manhattan, New York City.  It is the tallest building in the Western Hemisphere, and the sixth-tallest in the world.  The supertall structure has the same name as the North Tower of the original World Trade Center, which was destroyed in the terrorist attacks of September 11, 2001.  The new skyscraper stands on the northwest corner of the 16 acre World Trade Center site, on the site of the original 6 World Trade Center.  The building is bounded by West Street to the west, Vesey Street to the north, Fulton Street to the south, and Washington Street to the east.