Zacatecas (Spanish pronunciation: [sakaˈtekas]), officially Free and Sovereign State of Zacatecas (Spanish: Estado Libre y Soberano de Zacatecas), is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is divided in 58 municipalities and its capital city is Zacatecas.

It is located in North-Central Mexico. It is bordered by the states of Durango to the northwest, Coahuila to the north, Nayarit to the west, San Luis Potosí and Nuevo León to the east, and Jalisco, Guanajuato and Aguascalientes to the south.

The state of Zacatecas is best known for its rich deposits of silver and other minerals, its colonial architecture and its importance during the Mexican revolution. Its main economic activities are mining, agriculture and tourism.

"Zacatecas" is the Nahuatl-derived name for one of the indigenous peoples who inhabited the region before the arrival of the Spanish. The name ultimately derives from the Nahuatl word for a type of grass common in the region, zacatl. The region where this grass grew was originally called Zacatlan, and its inhabitants, Zacateca, pluralized in Mexican Spanish to Zacatecas.

John Herschel Glenn, Jr. (born July 18, 1921) is a former United States Marine Corps pilot, astronaut, and United States senator who was the first American to orbit the Earth and the third American in space. Glenn was combat aviator in the Marine Corps and one of the seven elite US military test pilots to be selected by the National Aeronautics and Space Administration (more commonly referred to as "NASA") to test fly and operate the experimental Mercury spacecraft outside of the mesosphere at altitudes above 115 miles (185 km) and at speeds exceeding 5,000 miles per hour (8,000 km/h) to become the first officially recognized American (US) astronauts. He flew the Friendship 7 mission on February 20, 1962. In 1965, Glenn retired from the military and resigned from NASA so he could be eligible to stand for election to public office. As a member of the Democratic Party he was elected to represent Ohio in the United States Senate from 1974 to 1999.

Glenn received a Congressional Space Medal of Honor in 1978, and the Presidential Medal of Freedom in 2012. He was inducted into the Astronaut Hall of Fame in 1990. On October 29, 1998, he became the oldest person to fly in space, and the only one to fly in both the Mercury and Space Shuttle programs, when at age 77, he flew on Discovery (STS-95). As of 2012, Glenn and M. Scott Carpenter are the last living members of the Mercury Seven.