Ground zero

Hiroshima is the capital of Hiroshima Prefecture in Japan. As of June 1, 2019, the city had an estimated population of 1,199,391. The gross domestic product (GDP) in Greater Hiroshima, Hiroshima Urban Employment Area, was US$61.3 billion as of 2010. Kazumi Matsui has been the city's mayor since April 2011.

Trinity was the code name of the first detonation of a nuclear weapon. It was conducted by the United States Army at 5:29 a.m. on July 16, 1945, as part of the Manhattan Project. The test was conducted in the Jornada del Muerto desert about 35 miles (56 km) southeast of Socorro, New Mexico, on what was then the Alamogordo Bombing and Gunnery Range, now part of White Sands Missile Range. The only structures originally in the vicinity were the McDonald Ranch House and its ancillary buildings, which scientists used as a laboratory for testing bomb components. A base camp was constructed, and there were 425 people present on the weekend of the test.

Jornada del Muerto was the name given by the Spanish conquistadors to the Jornada del Muerto Desert basin, and the almost waterless 90-mile (140 km) trail across the Jornada beginning north of Las Cruces and ending south of Socorro, New Mexico. The name translates from Spanish as "Dead Man's Journey" or "Route of the Dead Man". The trail was part of the Camino Real de Tierra Adentro which led northward from central colonial New Spain, present-day Mexico, to the farthest reaches of the viceroyalty in northern Nuevo México Province.

Socorro is a city in Socorro County in the U.S. state of New Mexico. It is in the Rio Grande Valley at an elevation of 4,579 feet (1,396 m). In 2010 the population was 9,051. It is the county seat of Socorro County. Socorro is located 74 miles (119 km) south of Albuquerque and 146 miles (235 km) north of Las Cruces.

On 6 and 9 August 1945, the United States detonated two atomic bombs over the Japanese cities of Hiroshima and Nagasaki, respectively. The two aerial bombings together killed between 129,000 and 226,000 people, most of whom were civilians, and remain the only use of nuclear weapons in an armed conflict. Japan surrendered to the Allies on 15 August, six days after the bombing of Nagasaki and the Soviet Union's declaration of war against Japan. The Japanese government signed the instrument of surrender on 2 September, effectively ending the war.

Japan is an island country in East Asia. It is situated in the northwest Pacific Ocean and is bordered on the west by the Sea of Japan, extending from the Sea of Okhotsk in the north toward the East China Sea, Philippine Sea, and Taiwan in the south. Japan is a part of the Ring of Fire, and spans an archipelago of 14,125 islands, with the five main islands being Hokkaido, Honshu, Shikoku, Kyushu, and Okinawa. Tokyo is the nation's capital and largest city, followed by Yokohama, Osaka, Nagoya, Sapporo, Fukuoka, Kobe, and Kyoto.

The Manhattan Project was a research and development undertaking during World War II that produced the first nuclear weapons. It was led by the United States with the support of the United Kingdom and Canada. From 1942 to 1946, the project was under the direction of Major General Leslie Groves of the U.S. Army Corps of Engineers. Nuclear physicist Robert Oppenheimer was the director of the Los Alamos Laboratory that designed the actual bombs. The Army component of the project was designated the Manhattan District as its first headquarters were in Manhattan; the placename gradually superseded the official codename, Development of Substitute Materials, for the entire project. Along the way, the project absorbed its earlier British counterpart, Tube Alloys. The Manhattan Project began modestly in 1939, but grew to employ nearly 130,000 people at its peak and cost nearly US$2 billion. Over 90 percent of the cost was for building factories and to produce fissile material, with less than 10 percent for development and production of the weapons. Research and production took place at more than thirty sites across the United States, the United Kingdom, and Canada.

The Oxford English Dictionary (OED) is the principal historical dictionary of the English language, published by Oxford University Press (OUP). It traces the historical development of the English language, providing a comprehensive resource to scholars and academic researchers, as well as describing usage in its many variations throughout the world.

A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission or a combination of fission and fusion reactions, producing a nuclear explosion. Both bomb types release large quantities of energy from relatively small amounts of matter.

Shima Hospital is a Japanese hospital, now clinic, in Hiroshima, Japan. It was the exact location where the atomic bombing of Hiroshima took place on August 6, 1945. Shima Hospital is considered to be ground zero.

The Aioi Bridge is an unusual "T"-shaped three-way bridge in Hiroshima, Japan. The original bridge, constructed in 1932, was the aiming point for the 1945 Hiroshima atom bomb because its shape was easily recognized from the air and also because the bridge was close to the center of the city. Although the bridge was not destroyed by the atomic blast, it did sustain heavy damage. After the war, the bridge was repaired and remained in service for nearly four decades, before it was replaced by a new bridge in 1983. A surviving portion of a floor girder from the original bridge was subsequently donated to the Hiroshima Peace Memorial Museum.

Nagasaki is the capital and the largest city of Nagasaki Prefecture on the island of Kyushu in Japan.

The Cold War was a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc. The term cold war is used because there was no large-scale fighting directly between the two superpowers, but they each supported opposing sides in major regional conflicts known as proxy wars. The conflict was based on the ideological and geopolitical struggle for global influence by these two superpowers, following their temporary alliance and victory against Nazi Germany and Imperial Japan in 1945. Aside from the nuclear arsenal development and conventional military deployment, the struggle for dominance was expressed via indirect means such as psychological warfare, propaganda campaigns, espionage, far-reaching embargoes, rivalry at sports events, and technological competitions such as the Space Race.

The Pentagon is the headquarters building of the United States Department of Defense, in Arlington County, Virginia, across the Potomac River from Washington, D.C.. It was constructed on an accelerated schedule during World War II. As a symbol of the U.S. military, the phrase The Pentagon is often used as a metonym for the Department of Defense and its leadership.

The United States Department of Defense is an executive branch department of the federal government of the United States charged with coordinating and supervising all agencies and functions of the U.S. government directly related to national security and the United States Armed Forces. The DoD is the largest employer in the world, with over 1.34 million active-duty service members as of June 2022. The DoD also maintains over 778,000 National Guard and reservists, and over 747,000 civilians bringing the total to over 2.87 million employees. Headquartered at the Pentagon in Arlington, Virginia, just outside Washington, D.C., the DoD's stated mission is to provide "the military forces needed to deter war and ensure our nation's security".

Arlington County is a county in the U.S. state of Virginia. The county is located in Northern Virginia on the southwestern bank of the Potomac River directly across from Washington, D.C.. The county is coextensive with the U.S. Census Bureau's census-designated place of Arlington. Arlington County is the second-largest city in the Washington metropolitan area, although it does not have the legal designation of an independent city or incorporated town under Virginia state law.

A snack bar usually refers to an inexpensive food counter that is part of a permanent structure where snack foods and light meals are sold.

The World Trade Center site, often referred to as "Ground Zero" or "the Pile" immediately after the September 11 attacks, is a 14.6-acre (5.9 ha) area in Lower Manhattan in New York City. The site is bounded by Vesey Street to the north, the West Side Highway to the west, Liberty Street to the south, and Church Street to the east. The Port Authority of New York and New Jersey (PANYNJ) owns the site's land. The original World Trade Center complex stood on the site until it was destroyed in the September 11 attacks.

The September 11 attacks, commonly known as 9/11, were four coordinated suicide terrorist attacks carried out by the militant Islamist extremist network al-Qaeda against the United States on September 11, 2001. That morning, nineteen terrorists hijacked four commercial airliners scheduled to travel from the East Coast to California. The hijackers crashed the first two planes into the Twin Towers of the World Trade Center in New York City, and the third into the Pentagon in Arlington County, Virginia near Washington, D.C. The fourth plane was similarly intended to hit a federal government building in D.C., but crashed in a field following a passenger revolt. The attacks killed nearly 3,000 people and instigated the global war on terror.

Al-Qaeda is a Sunni pan-Islamist militant organization led by Salafi jihadists who self-identify as a vanguard spearheading a global Islamist revolution to unite the Muslim world under a supra-national Islamic state known as the Caliphate. Its members are mostly composed of Arabs, but also include other peoples. Al-Qaeda has mounted attacks on civilian and military targets in various countries, including the 1998 United States embassy bombings, the 2001 September 11 attacks, and the 2002 Bali bombings; it has been designated as a terrorist group by the United Nations Security Council, the North Atlantic Treaty Organization (NATO), the European Union, and various countries around the world.

Terrorism, in its broadest sense, is the use of intentional violence and fear to achieve political or ideological aims. The term is used in this regard primarily to refer to intentional violence during peacetime or in the context of war against non-combatants. The terms "terrorist" and "terrorism" originated during the French Revolution of the late 18th century but became widely used internationally and gained worldwide attention in the 1970s during the Troubles in Northern Ireland, the Basque conflict, and the Israeli–Palestinian conflict. The increased use of suicide attacks from the 1980s onwards was typified by the 2001 September 11 attacks in the United States.

New York, often called New York City or NYC, is the most populous city in the United States. With a 2020 population of 8,804,190 distributed over 300.46 square miles (778.2 km2), New York City is the most densely populated major city in the United States and more than twice as populous as Los Angeles, the nation's second-largest city. New York City is located at the southern tip of New York State. It constitutes the geographical and demographic center of both the Northeast megalopolis and the New York metropolitan area, the largest metropolitan area in the U.S. by both population and urban area. With over 20.1 million people in its metropolitan statistical area and 23.5 million in its combined statistical area as of 2020, New York is one of the world's most populous megacities, and over 58 million people live within 250 mi (400 km) of the city. New York City is a global cultural, financial, entertainment, and media center with a significant influence on commerce, health care and life sciences, research, technology, education, politics, tourism, dining, art, fashion, and sports. Home to the headquarters of the United Nations, New York is an important center for international diplomacy, and is sometimes described as the capital of the world.

The collapse of the World Trade Center occurred on Tuesday, September 11, 2001, after two hijacked commercial airliners were deliberately flown into the Twin Towers of the World Trade Center complex in New York City as part of the September 11 attacks. The North Tower was the first building to be hit when American Airlines Flight 11 crashed into the skyscraper at 8:46 a.m., causing it to collapse at 10:28 after burning for 1 hour and 41 minutes. At 9:03 a.m., the South Tower was struck by United Airlines 175, collapsing at 9:58 that morning after 55 minutes of burning. The resulting debris severely damaged or destroyed more than a dozen other adjacent and nearby structures, ultimately leading to the collapse of 7 World Trade Center at 5:21 p.m. A total of 2,763 people were killed in the hijackings, crashes, fires, and subsequent collapses, including 2,192 civilians, 343 firefighters, and 71 law enforcement officers as well as all the passengers and crew on the airplanes, which included 147 civilians and the 10 hijackers. The 110-story towers are the tallest freestanding structures ever to collapse.

One World Trade Center, also known as One World Trade, One WTC, and formerly the Freedom Tower, is the main building of the rebuilt World Trade Center complex in Lower Manhattan, New York City. Designed by David Childs of Skidmore, Owings & Merrill, One World Trade Center is the tallest building in the United States, the tallest building in the Western Hemisphere, and the seventh-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 (6.5 ha) World Trade Center site, on the site of the original 6 World Trade Center. It is bounded by West Street to the west, Vesey Street to the north, Fulton Street to the south, and Washington Street to the east.

The National September 11 Memorial & Museum is a memorial and museum in New York City commemorating the September 11 attacks of 2001, which killed 2,977 people, and the 1993 World Trade Center bombing, which killed six. The memorial is located at the World Trade Center site, the former location of the Twin Towers that were destroyed during the September 11 attacks. It is operated by a non-profit institution whose mission is to raise funds for, program, and operate the memorial and museum at the World Trade Center site.

Park51 is a development originally envisioned as a 13-story Islamic community center and mosque in Lower Manhattan, New York City. The developers hoped to promote an interfaith dialogue within the greater community. Due to its proposed location, two blocks from the World Trade Center site of the September 11 attacks, the proposed building was widely and controversially referred to as the "Ground Zero mosque".

Michael Rubens Bloomberg is an American businessman, politician, philanthropist, and author. He is the majority owner, co-founder and CEO of Bloomberg L.P. He was Mayor of New York City from 2002 to 2013, and was a candidate for the 2020 Democratic nomination for President of the United States. He has served as chair of the Defense Innovation Board, an independent advisory board that provides recommendations on artificial intelligence, software, data and digital modernization to the United States Department of Defense, since June 2022.