Short answers, pulled from the story.
Estadio Cuauhtémoc has a capacity of 51,726 seats following renovations completed in 2015. Before those renovations, the capacity stood at 42,648, and the original 1968 configuration held 35,000 spectators.
Pedro Ramírez Vázquez designed Estadio Cuauhtémoc in 1965. He is also the architect behind the Estadio Azteca and the Basilica of Our Lady of Guadalupe.
The stadium is named after Cuauhtémoc-Moctezuma, a Mexican brewery that paid for most of the construction costs. It was inaugurated on the 6th of October 1968.
Estadio Cuauhtémoc hosted group stage matches for the 1970 FIFA World Cup, including Uruguay's matches against Israel, Italy, and Sweden. In the 1986 FIFA World Cup it hosted group stage matches for Italy and Argentina, a round of 16 match between Argentina and Uruguay on the 16th of June 1986, and a quarter-final between Spain and Belgium on the 22nd of June 1986 that drew a stadium-record 45,000 fans.
Estadio Cuauhtémoc is the first stadium in Latin America to have its facade covered with ETFE, a material previously used in stadium projects globally. The covering was added during renovations that ran from November 2014 to November 2015.
Club Puebla won the Mexican Primera División final at Estadio Cuauhtémoc in the 1982-83 tournament, defeating C.D. Guadalajara. The club also won the Copa México in 1990, making Estadio Cuauhtémoc only the fifth stadium to host both a league final and a cup final won by the home team.