Why are constitutions often written after wars, coups, revolutions, or economic crises?

Constitutions are frequently written or replaced following cataclysmic events—such as wars, coups, revolutions, or economic crises—because these moments often signal a collapse of the existing political order and a desperate need to establish new legitimacy.12

When a state undergoes a fundamental rupture, the previous governing framework often loses its authority or ability to function. In these instances, a new constitution serves several critical purposes:

• Establishing New Authority: A constitution provides a formal, legal-rational framework to justify the power of new leaders or regimes, effectively replacing the old order with a "clean slate".12
• Institutionalizing Change: Following a revolution or coup, new actors often use a constitution to codify their goals and restructure the state’s institutions to reflect the new balance of political forces.31
• Restoring Stability: By defining the rules of political procedure, a constitution aims to provide a predictable framework for governance, which is essential after periods of violence or institutional flux.45

While crises often act as catalysts for constitutional engineering, it is important to note that not all constitutional changes are born of catastrophe; some states pursue reform during periods of relative continuity to adapt to evolving social or economic needs.16