Following the fall of Marcos Pérez Jiménez in 1958, Venezuelan politics were dominated by the Third Way Christian democratic COPEI and the center-left social democratic Democratic Action (AD) parties; this two-party system was formalized by the "puntofijismo" arrangement. Economic crises in the 1980s and 1990s led to a political crisis which resulted in hundreds dead in the Caracazo riots of 1989, two attempted coups in 1992, and impeachment of President Carlos Andrés Pérez for corruption in 1993. A collapse in confidence in the existing parties saw the 1998 election of Hugo Chávez, who had led the first of the 1992 coup attempts, and the launch of a "Bolivarian Revolution", beginning with a 1999 Constituent Assembly to write a new Constitution of Venezuela.