Why does a democratic country need a Constitution?

Explanation:

A constitution lays out the important principles that govern decision-making in the country's many communities.

It establishes the ideals that form the foundation of the kind of country that its citizens aspire to live in, as well as the rules and principles that must be followed in order for the country to be governed.

It establishes rules to protect minorities' interests and prevent the majority from dominating minorities.

It establishes rules to prevent any politician from abusing power.

It also gives its residents rights and safeguards their freedom.

Final answer:

Hence, democratic country needs a Constitution as it lays out the important principles that govern decision-making, establishes the ideals that form the foundation, rules to protect minorities' interests, rules to prevent any politician from abusing power, and gives residents rights of freedom.