João Bernardo Vieira's autocratic rule and the 1993 constitution (1980-1999)
Vieira ruled Guinea-Bissau for 19 years, concentrating power within the executive, politicizing the military, and facilitating abuses of power and impunity. The 1993 constitution adopted a semi-presidential system specifically to end overconcentration of power in the presidency.
Vieira was deposed in 1998-99 after a brutal civil war; the power-sharing system took hold.
The semi-presidential system created chronic president-prime minister conflict, but prevented the re-emergence of a single dominant executive — until now.
The 2026 referendum explicitly reverses the 1993 constitutional settlement, undoing the anti-authoritarian design that followed Vieira's rule.
