This is an excerpt about 9/11 from a seven-page chapter on the war on terrorism in ''The American Vision," a US history textbook commonly used in high school classrooms across the country, including at Arlington High School.
''The terrorist attacks on September 11, 2001, killed all 266 passengers and crewmembers on the four hijacked planes. Another 125 people died in the Pentagon. In New York City, nearly 3,000 people died. More Americans were killed in the attacks than died at Pearl Harbor or on D-Day in World War II.
''The attacks on the World Trade Center and the Pentagon were acts of terrorism. Terrorism is the use of violence by nongovernmental groups against civilians to achieve a political goal. Terrorist acts are intended to instill fear in people and to frighten their governments into changing their policies."