Hugo Chavez was the President of

A country's president is a specific individual tied to that nation's own political history; national leaders are not interchangeable across neighbouring countries, so identifying "who was President of which country" requires matching the named leader to the correct nation and time period.

Hugo Chavez was elected President of Venezuela in December 1998, took office in February 1999, was re-elected in 2000, 2006 and 2012, and remained in office until his death in March 2013. During his presidency he led what he called the "Bolivarian Revolution", nationalising key industries and founding regional blocs such as ALBA.

• Uruguay: at various points during this era its heads of state included Julio Maria Sanguinetti, Jorge Batlle, Tabare Vazquez and Jose Mujica, never Hugo Chavez.

• Argentina: at various points during this era its heads of state included Carlos Menem, Fernando de la Rua, Eduardo Duhalde, Nestor Kirchner and Cristina Fernandez de Kirchner, never Hugo Chavez.

• Brazil: at various points during this era its heads of state included Fernando Henrique Cardoso, Luiz Inacio Lula da Silva and Dilma Rousseff, never Hugo Chavez.

Hence, Hugo Chavez was President of Venezuela.