According to the Declaration of Independence a ruler's denial of citizens rights was a justification for the open rebellion against such a government. The Declaration of Independence was to declare and to justify why the colonies sought to rid themselves of the British Crown's control because they felt their natural rights to self-government and representation were being denied by the British Government.
The census is designed to count several important factors about a country's population. These things include gender, race, what jobs people have, and more.