The main obligation of a citizen is allegiance to the state. This means that citizens have a responsibility to be loyal and devoted to their country and its laws, customs, and traditions. This includes obeying the laws, paying taxes, and participating in the democratic process. By fulfilling this obligation, citizens help to ensure the stability and prosperity of their country, and promote the common good of all its members. While other obligations such as registering for elections, serving in the army, and having the right to life are important, they are not the main obligation of a citizen.